-----------------------------------------------------------------
Quiz of the Day
*1-Which Stars are Comparatively Cooler?*
Red Dwarf or Brown Dwarf
*2- Two planets A & B have same radius but A is a rocky
Planet & B is a Gaseous planet. Then escape velocity will be higher from
the surface of which planet?*
A or B
*3-Which for the two would have a higher escape velocity from
Earth's Surface?*
Ant or Elephant
*4-Which of the following bodies in the solar system dont
have surface lakes?*
Earth or Triton or Titan or Io
*5-Which of the following is not part of Black Holes?*
Chromoshphere or Ergosphere
*6-The brightest objects in Universe are.*
Quasars or Galaxies
*7-Which element is present in highest proportion in Saturn?*
Hydrogen or Carbon
*8-Originally, the Nuclear fusion reactions occurring inside
Sun's core produce light in which form?*
Gama rays or Radio Waves
:::::::::::::::::::::::::::::::::::::::::::::
Answers for the Quiz
*1-Brown Dwarf*
These stars don't have sufficient mass to undergo fusion,
hence they are cooler.
*2-A*
Because escape velocity is proportional to density of a
planet & Gas giants are less dense so less escape velocity for them.
*3-Both will have same*
Escape velocity depends only on mass of the planet and not on
mass of the object.
*4-Triton*
Earth has water lakes, Titan has methane lakes, Io has lava
lakes
*5-Chromosphere*
Chromosphere is a part of Star, Ergosphere is a part of
rotating black hole.
*6-Quasars*
Quasars(black holes feeding on huge amount of matter) are so
bright that they can outshine galaxies.
*7-Hydrogen*
Gas giants have hydrogen & helium as major components
*8-Gama Rays*
Originally gamma rays are produces in Sun's core but as they
travel through the plasma layers, they lose energy and final light emitted from
sun's surface is in visible & UV Spectrum.
----------------------------------------------------------------
समुद्राला भरती व ओहोटी का येते?
पृथ्वी आणि चंद्र यांच्या एकमेकांच्या होणार्‍या गुरुत्वाकर्षणाच्या प्रभावामुळेच समुद्राला भरती व ओहोटी का येते. चंद्राच्या गुरुत्वाकर्षणाने पृथ्वीचा तर पृथ्वीच्या गुरुत्वाकर्षणाने चंद्राचा भाग खेचला जातो. चंद्राचा पृथ्वीच्या जमीनीवर होणारा प्रभाव फारच कमी असल्याने तो जाणवत नाही. परंतू पृथ्वीवरील पाण्यावर म्हणजेच समुद्रावर हा प्रभाव प्रकर्षाने दिसून येतो.
पृथ्वीला स्वतःभोवती एक प्रदक्षिणा पूर्ण करण्यासाठी २४ तास लागतात म्हणजेच १२ तासांच्या अंतराने चंद्र पृथ्वीच्या दोन विरुद्ध बाजूस असतो. दुसरी गोष्ट अशी की चंद्र दररोज ५० मिनिटे उशिरा उगवतो म्हणजेच जवळपास १२.२५ तासांच्या अंतराने तो दिवसभरामध्ये पृथ्वीच्या दोन विरुद्ध बाजूस असतो. अशा प्रकारे पृथ्वीभोवती फिरताना अथवा पृथ्वी स्वतःभोवती फिरताना पृथ्वीचा जो भाग चंद्राच्या दिशेने असतो त्या आणि त्याच्या विरुद्ध बाजूस चंद्राच्या गुरुत्वाकर्षणाने भरती आलेली असते.
पौर्णिमा आणि अमावास्येच्या वेळी सूर्य आणि चंद्र हे पृथ्वीसापेक्ष एकाच रेषेमध्ये येतात, यावेळेस सूर्य आणि चंद्र या दोघांच्या गुरुत्वाकर्षणाचा जास्त प्रभाव पृथ्वीवर पडतो आणि समुद्राला मोठी भरती येते, यालाच 'उधाणाची भरती' असे देखिल म्हणतात
----------------------------------------------------------------
Quiz of the day
*1-SPACE IS COMPLETELY SILENT*
True or False
*2-THE HOTTEST PLANET IN OUR SOLAR SYSTEM IS*
Mercury or Venus
*3-HALLEY'S COMET WON’T ORBIT PAST EARTH AGAIN UNTIL*
2061 or 2041
*4-ONE DAY ON VENUS IS LONGER THAN ONE...*
Month or Year
*5-THE LARGEST KNOWN ASTEROID IS*
Vesta or Ceres
*6-IF TWO PIECES OF THE SAME TYPE OF METAL TOUCH IN SPACE
THEY WILL PERMANENTLY BOND DUE TO*
cold Welding or Vacuum
*7-What it the closest thing to a perfect sphere observed in
nature*
Moon or Sun or Pluto
*8-The Sun rotates in which direction compared to Earth*
West to East or East to West
*9-The ion tail of a comet is the result of*
Radiation or Solar Wind
*10-How many people have ever walked on the Moon*
10 or 12 or 16
*11-The largest object in the Kuiper belt is*
Eris or Pluto
*12-Most luminous star Known*
Sirius or Pistol
*13-The boundary where the Space starts from earth*
Exosphere or Karman Line
*14-Hubble orbits in low Earth orbit at an altitude of
approximately*
780km or 540kms or 980Kms
*15-Which is the first planet discovered with a telescope*
Neptune or Mars or Uranus
::::::::::::::::::::::::::::::::::
Answers
*1-True*
*2-Venus*
*3-2061*
*4-Year*
*5-Ceres*
*6-Cold welding*
*7-Sun*
*8-West to east*
*9-Solar Wind*
*10-12*
*11-Pluto*
*12-Pistol*
*13-Karman line*
*14-540kms*
*15-Uranus*
::::::::::::::
Explanations
1-There is no atmosphere in space, which means that sound has
no medium or way to travel to be heard. Astronauts use radios to stay in
communication while in space, since radio waves can still be sent and received.
2- Venus is the hottest planet in the solar system and has an
average surface temperature of around 450° C. Interestingly, Venus is not the
closest planet to the Sun – Mercury is closer but because Mercury has no
atmosphere to regulate temperature it has a very large temperature fluctuation
3-Discovered in 1705 by Edmond Halley, the famous comet was
last seen in 1986 and is only seen once every 75 to 76 years.
4-Venus has a slow axis rotation which takes 243 Earth days
to complete its day. The orbit of Venus around the Sun is 225 Earth days, making
a year on Venus 18 days less than a day on Venus.
5-Discovered by Italian astronomer Giuseppe Piazzi in 1801,
the dwarf planet Ceres (965 KM) was the first, and largest, object to be
considered an asteroid. It is located in the Asteroid Belt between the orbits
of Mars and Jupiter and accounts for 33% of the entire belt’s mass.
6-Cold welding happens because the atoms of two pieces of
metal have no way of knowing they are separate. This doesn’t happen on Earth
because of the air and water found between the pieces.
7-Considering the sheer size of the Sun, there is only a 10
km difference in its polar and equatorial diameters – this makes it the closest
thing to a perfect sphere observed in nature.
8- Sun rotates from west to east instead of east to west like
Earth.
9- solar winds blows the gas particles directly away from the
Sun, Making a Ion tail for comet.
10-Besides Neil Armstrong and Buzz Aldrin – who were the
first two astronauts to leave their bootprints on the Moon — there were also
Pete Conrad, Alan Bean, Alan Shepard, Edgar Mitchell, David Scott, James Irwin,
John Young, Charles Duke, Eugene Cernan, and Harrison Schmitt.
11- Pluto is the largest and most massive member of the
Kuiper belt, and the largest and the second-most-massive known TNO, surpassed
only by Eris in the scattered disc.
12-The Pistol Star, also known as V4647 Sagittarii, is a blue
hypergiant star located about 25,000 light years from Earth in the
constellation Sagittarius. It is a candidate luminous blue variable (cLBV) and
one of the most luminous stars known, with a luminosity 1,600,000 times that of
the Sun.
13-A common definition of space is known as the Kármán Line,
an imaginary boundary 100 kilometers (62 miles) above mean sea level.
14-Hubble orbits in low Earth orbit at an altitude of
approximately 540 kilometers (340 mi) and an inclination of 28.5°. The position
along its orbit changes over time in a way that is not accurately predictable.
15-Sir William Herschel announced its discovery on 13 March
1781, expanding the known boundaries of the Solar System for the first time in
history and making Uranus the first planet discovered with a telescope.
----------------------------------------------------------------
*ORBITER* - Orbiters fly around the planet making observations
like weather and mapping, and often acting as communications relays for
experiments on the surface.
e.g.- Mangalyaan, Mars Reconnaissance Orbiter,
*ROVER* - Rovers are those 6 wheeled utility vehicles that
trundle slowly around on the surface, taking pictures and performing a variety
of geological and chemical tests and analyses.
e.g. Curiosity Rover, Opportunity Rover
*LANDERS* - Landers touch down and perform experiments within
reach of it’s robotic arms, usually focusing on weather observations and soil
analysis.
e.g. Insight Lander, Chang'e 4 Lander
*PROBE* -a small spacecraft, with no one travelling in it,
sent into space to make measurements and send back information to scientists on
earth
e.g. Solar Parker Probe, Cassini Probe, Voyager Probes
So next time when you come across this terms, you will know
whats it designed for...!
----------------------------------------------------------------
Pulsars First Discovery: Feb. 24, 1968*
On Feb. 24, 1968, an astronomy grad student Jocelyn Bell
announced that she had discovered the first pulsar.
For earlier few months she was noticing a signal occurring
from space at pulses every 1.3 seconds.
Bell and Hewish, her instructor, found four pulsars before
publishing their findings, but they still had no explanation.
They checked all their instruments, other sources for
possible source.
Scientists have since figured out that pulsars are rapidly
spinning neutron stars that radiate narrow beams of light in opposite
directions.
Neutron stars are some of the most exotic objects in the
universe. The leftover cores of long-dead massive stars, they are macroscopic
objects with densities of atomic nuclei.
Since they are stars where very high mass is compressed in
small volume, they spin very fast to maintain balance.
With electric charge and fast rotation, it makes very strong
magnetic field and alternatively electric charge.
All this creates a beam of radiation escaping from the
magnetic poles. If Earth is in the line of this pole, we detect this beam as a
signal produced every rotation and call the star a Pulsar
----------------------------------------------------------------
What is Nebula?
A nebula is a giant cloud of dust and gas in space. Some
nebulae (more than one nebula) come from the gas and dust thrown out by the
explosion of a dying star, such as a supernova. Other nebulae are regions where
new stars are beginning to form
*what is a Supernova?*
A supernova is an explosion of a massive super-giant star. It
may shine with the brightness of 10 billion suns!
*what is a neutron star?*
Neutron stars are formed when a massive star runs out of fuel
and collapses. The very central region of the star – the core – collapses,
crushing together every proton and electron into a neutron. one of the most
densest object ever.
*what is a pulsar?*
Most neutron stars are observed as pulsars. Pulsars are
rotating neutron stars observed to have pulses of radiation, Pulsars have very
strong magnetic fields which funnel jets of particles out along the two
magnetic poles.
*what is a asteroid?*
Asteroids are small, rocky objects that orbit the sun.
Although asteroids orbit the sun like planets, they are much smaller than
planets.
*what is a meteor?*
Sometimes one asteroid can smash into another. This can cause
small pieces of the asteroid to break off. Those pieces are called
meteoroids.If a meteoroid comes close enough to Earth and enters Earth’s
atmosphere, it vaporizes and turns into a meteor
*what are Meteorites?*
Sometimes meteoroid rocks don’t vaporize completely in the
atmosphere. In fact, sometimes they survive their trip through Earth’s
atmosphere and land as rocks on the Earth’s surface. Those rocks are called
meteorites.
*what is a comet?*
Comets orbit the Sun, like asteroids. But comets are made of
ice and dust—not rock.As a comet’s orbit takes it toward the Sun, the ice and
dust begin to vaporize. That vaporized ice and dust become the comet’s tail.
*what is a Red Giant star?*
A red giant star is a dying star(star with high Mass) in the
last stages of stellar evolution.
*what is a White Dwarf star?*
A white dwarf is what stars like the Sun become after they
have exhausted their nuclear fuel. Near the end of its nuclear burning stage.
*what is a brown dwarf?*
Sometimes collapsing clouds of gas and dust don't quite
manage to make it as stars. These objects, known as brown dwarfs,(failed Star)
*what is a equinox?*
An equinox event is time when the plane of Earth's equator
passes through the center of the Sun. This occurs twice each year: around 20
March and 23 September. During this We have equal day & night (12hrs day 12
hrs night)
*What is a solstice?*
A solstice is an event occurring when the Sun appears to
reach its most northerly or southerly excursion relative to the celestial
equator on the celestial sphere. Two solstices occur annually, around June 21
and December 21.
----------------------------------------------------------------
The temperature of a star determines it's colour.Blue-white
stars are hottest. Yellow star are medium hot.Cooler stars are red.
----------------------------------------------------------------
Questions and Answers
1. Why are certain telescopes in space?
A. It is cheaper to put them in space
B. You can only see visible light from space
C. The atmosphere blocks certain EM waves
D. They are closer to what they are studying
------------
2. What two things are required for nuclear fusion?
A. Hydrogen and helium
B. High heat and force
C. Uranium and plutonium
D. Pressure and water
------------
3. What two steller objects come after a red giant in the
life cycle of stars?
A. Planetary nebula and white dwarf
B. Supernova and neutron star
C.Neutron star and black hole
D. Supergiant star and neutron star
------------
4. What two stellar objects can arise from a supernova?
A. White dwarf and black dwarf
B. Neutron star and black hole
C. Red giant and red supergiant
D. black hole and black dwarf
------------
5. E=mc2
In the equation , what does the E stand for?
A. Mass
B. Speed of light
C. Energy
D. Wavelength
------------
6. When does a star leave the main sequence?
A. When it runs out of helium to fuse
B. When it turns into a black dwarf
C. When it turns into a planetary nebula
D. When it runs out of hydrogen to fuse
------------
7. What color are the hottest stars?
A.Red
B. White
C. Blue
D. Yellow
------------
8. What competing forces keep main sequence stars at
equilibrium?
A. Gravity and pressure from nuclear fusion
B. Gravity and mass
C. Stars are unstable and not at equilibrium
D. Nuclear fusion and magnetism
------------
9. What two things are needed to start nuclear fusion?
A. High heat and low pressure
B. High heat and high pressure
C. Hydrogen and helium
D. Uranium and plutonium
------------
10. What does being close to the sun mean to the
inner planets?
A. It makes them bigger than the other planets
B. It makes them orbit in the same direction
C. It made them consist primarily of rock
D. It means they will all spiral into the sun in 2
million years
------------
11. What is a redshift?
A. Means an object is moving away from us
B. Means the objects light has had its frequency lowered
C. It is evidence for an expanding universe
D. All of the above
------------
12. What evidence do we have of the inflation right
after the Big Bang?
A. The sun's existence
B. Cosmic background radiation
C. Life on this planet
D. Most objects in the universe are coming towards us
ANS
1-C
View from Telescopes on land are defracted due to dust,
clouds, atmospheric turbulence etc..
2-B
for a nuclear fusion tremendous heat and pressure or force is
required... like hydrogen gas in the core of the Sun. It gets squeeze together
so tightly that four hydrogen nuclei combine to form one helium atom. ... In
the process some of the mass of the hydrogen atoms is converted into energy in
the form of light
3-A
Red Giant is formed when a Star like our Sun burns all of
it's hydrogen to helium. At this time it will start burning Helium to Carbon
until it runs out of Helium and since it will not be dense enough to form other
heavier elements like Iron, the fusion process will stop, making the Star
collapse on it's core due to inward acting gravity as there will be no Fusion
energy to Stabilize this gravity.
At this time the Redgiant will calmly shed it's outer layers
into Space called a Planetary nebula and become a White Dwarf, a cool extremely
Dense Star.
4-B
Supernova occurs when massive stars die with an explosion,
What happens to the star after the supernova depends on how big it was to begin
with. If the star was only a few times bigger than the Sun, the core will
shrink into a tiny neutron star only a few miles across. If the star was much
bigger than the Sun, the core will shrink down to a black hole.
5-C
E-Energy M-Mass C-Speed of light
6-D
Main sequence stars fuse hydrogen atoms to form helium atoms
in their cores. About 90% of the stars in the universe, including the sun, are
main sequence stars.
7-C
Blue - temp 25,000 K eg-Spica
White- temp 10,000 K eg-Vega
Yellow -temp 6000 K eg-Sun
Red- temp 3000 K eg-Betelgeuse
8-A
Gravity pushes the outer surface of stars inwards..the
pressure from nuclear fusion inside the core pushes the star outwards...these
pressures stay at equilibrium untill the fuel Runs out... when the fuel runs
out the inner pressure lowers n gravity collapses the star.
9-B
answer is same as quest. no.2
10-C
Inner planets are made mostly of rocks.. Mercy, Venus, Earth
& Mars
Outer Planet are made of gas.. Jupiter, Saturn, Neptune &
Uranus
11-D
Redshift and blueshift describe how light shifts toward
shorter or longer wavelengths as objects in space (such as stars or galaxies)
move closer or farther away from us. So all the above terms are definition of
Redshift
12-B
Inflation means spreading of the universe in all directions
from a singularity after a Big Bang.
Sun came to existance very long after big bang
Life came too late...
The only way to analyze this is Radiations and Cosmic
background that is enternal space we see today
-------------------------------------------------------
In simple language please explain Hubble constant 72 +/- 8
km/s/Mpc... With focus on MPC ...
*Hubble's constant*
*1. Constant of proportionality*
If you draw a straight line, the equation of line give you
the constant of proportionality.
*Equation is y = cx*, c being constant. Similar equation can
be written in different forms. So it's mathematical term. So it's also ratio of
y/x =c.
*2. Hubble's constant*
Hubble's equation is v= H*D where v is velocity, D is
distance of galaxy measured in Mpc, H is Hubble's constant.
*Meaning of Hubble's constant*
Mpc is Megaparsec, a unit of measurement of distance.
1 Parsec = 3.26 light years.
1Mpc is 1 Megaparsec.
V = H*D
The velocity V is velocity of galaxies with which they are
moving away. As the distance of galaxy increases, their velocity also
increases.
Value of H depend upon time. So it's value was different in
past and will be different in future. (We are considering Universe here which
is expanding).
So it is changing it's value as per the age of Universe.
In other words, Hubble's constant describes the expansion of
Universe.
This is small description. It is related with Universe, Big
bang, Galaxy and their speed, distance to galaxies, size of Universe, dark
matter and dark energy. It's also a reason basis given for why our night sky is
dark.
Hubble's equation is one of pioneering discovery based on
observation.
----------------------------------------------------------------------
*What is Nebula?*
A nebula is a giant cloud of dust and gas in space. Some
nebulae (more than one nebula) come from the gas and dust thrown out by the
explosion of a dying star, such as a supernova. Other nebulae are regions where
new stars are beginning to form
*what is a Supernova?*
A supernova is an explosion of a massive super-giant star. It
may shine with the brightness of 10 billion suns!
*what is a neutron star?*
Neutron stars are formed when a massive star runs out of fuel
and collapses. The very central region of the star – the core – collapses,
crushing together every proton and electron into a neutron. one of the most
densest object ever.
*what is a pulsar?*
Most neutron stars are observed as pulsars. Pulsars are
rotating neutron stars observed to have pulses of radiation, Pulsars have very
strong magnetic fields which funnel jets of particles out along the two
magnetic poles.
*what are quasars?*
A quasar can be defined as an extremely Active Galactic
Nucleus.An AGN is nothing more than a supermassive black hole that is
active and feeding at the center of a galaxy. They are extremely bright and
sometimes mistaken for stars. However, the energy output of a star is
nowhere near the amount of energy pumped out by a quasar. The word
“quasar” originates from the contraction of
“quasi-stellar”, which references a star-like radio source.
*what is a asteroid?*
Asteroids are small, rocky objects that orbit the sun.
Although asteroids orbit the sun like planets, they are much smaller than
planets.
*what is a meteor?*
Sometimes one asteroid can smash into another. This can cause
small pieces of the asteroid to break off. Those pieces are called
meteoroids.If a meteoroid comes close enough to Earth and enters Earth’s
atmosphere, it vaporizes and turns into a meteor
*what are Meteorites?*
Sometimes meteoroid rocks don’t vaporize completely in the
atmosphere. In fact, sometimes they survive their trip through Earth’s
atmosphere and land as rocks on the Earth’s surface. Those rocks are called
meteorites.
*what is a comet?*
Comets orbit the Sun, like asteroids. But comets are made of
ice and dust—not rock.As a comet’s orbit takes it toward the Sun, the ice and
dust begin to vaporize. That vaporized ice and dust become the comet’s tail.
*what is a Red Giant star?*
A red giant star is a dying star(star with high Mass) in the
last stages of stellar evolution.
*what is a White Dwarf star?*
A white dwarf is what stars like the Sun become after they
have exhausted their nuclear fuel. Near the end of its nuclear burning stage.
*what is a brown dwarf?*
Sometimes collapsing clouds of gas and dust don't quite
manage to make it as stars. These objects, known as brown dwarfs,(failed Star)
*what is a equinox?*
An equinox event is time when the plane of Earth's equator
passes through the center of the Sun. This occurs twice each year: around 20
March and 23 September. During this We have equal day & night (12hrs day 12
hrs night)
*What is a solstice?*
A solstice is an event occurring when the Sun appears to
reach its most northerly or southerly excursion relative to the celestial
equator on the celestial sphere. Two solstices occur annually, around June 21
and December 21.
---------------------------------------------------------
*WEEKEND QUIZ* *1)What powerful force allows black holes to
absorb light?*
a. Nuclear fusion
b. Electromagnetism
c. Gravity
d. Nuclear bonding
e. All of the above
*2) How do scientists know that black holes exist?*
a. By running experiments on the Sun
b. By observing objects and light around black holes
c. By viewing black holes with powerful telescopes
d. All of the above
e. None of the Above
*3) How do black holes form?*
a. When planets collide
b. When nuclear bombs explode
c. When comets strike planets
d. When giant stars explode
e. When asteroids hit stars
*4) Where do super massive black holes likely exist?*
a. At the center of the Solar System
b. Inside gas giant planets
c. At the center of galaxies
d. All of the above
e. None of the Above
*5) True or False: Black holes are invisible because they
don't reflect light.*
a. TRUE
b. FALSE
*6) What do we call the boundary around a black hole where
nothing can escape its gravity?*
a. The Great Wall
b. Singularity
c. Supernova border
d. Pulsar
e. Event horizon
*7) What is the center of a black hole called?*
a. Iris
b. Singularity
c. Supernova
d. Pulsar
e. Event horizon
*8) What is it called when an aging star explodes?*
a. Iris
b. Singularity
c. Supernova
d. Pulsar
e. Event horizon
*9) True or False: Black holes were first discovered by
Ancient Egyptian astronomers around 3000 BCE.*
a. TRUE
b. FALSE
*10) What makes the gravity of a black hole so strong?*
a. Its large size and small mass
b. Nuclear reactions at its core
c. It spins at a rate faster than light
d. Its small size and large mass
e. All of the above
*ANSWERS*
*1-c*
Black holes don’t absorb light, their gravity simply prevents
light from escaping. They have so much gravity, even light cannot escape
*2-b*
Black holes have such a strong gravitational pull that even
photons can’t escape from inside it. Photons are the particles that produce
light, which allow us to see things. We can’t even “see” a black hole itself.
We can only observe what happens to objects that are close to it.
*3-d*
black holes form when the center of a very massive star
collapses in upon itself. This collapse also causes a supernova, or an
exploding star, that blasts part of the star into space
*4-c*
Stellar black holes are all around galaxy, when a star dies
but Supermassive blackholes thrive in the center of most of galaxies..
*5-a*
A black hole itself is invisible because no light can escape
from it.
*6-e*
Event horizon, boundary marking the limits of a black hole.
At the event horizon, the escape velocity is equal to the speed of light. Since
general relativity states that nothing can travel faster than the speed of
light, nothing inside the event horizon can ever cross the boundary and escape
beyond it, including light.
*7-b*
In the center of a black hole is a gravitational singularity,
a one-dimensional point which contains a huge mass in an infinitely small
space, where density and gravity become infinite and space-time curves
infinitely, and where the laws of physics as we know them cease to operate.
*8-c*
When a aging massive star dies it collapses in upon itself.
This collapse also causes a supernova, or an exploding star.
*9-b*
Albert Einstein first predicted black holes in 1916 with his
general theory of relativity. The term "black hole" was coined in
1967 by American astronomer John Wheeler, and the first one was discovered in
1971.
*10-d*
Black holes are incredibly massive, but cover only a small
region. Because of the relationship between mass and gravity, this means they
have an extremely powerful gravitational force. Virtually nothing can escape
from them — under classical physics, even light is trapped by a black hole
NOW SHARE YOUR SCORES...!!!
----------------------------------------------------------------------------
*QUIZ OF THE DAY*
*1. Who was the commander of the first U.S. Space Shuttle
mission?*
A. Robert Crippen
B. Ron McNairy
C. Thomas Mattingly
D. John Young
*2. The Horsehead Nebula can be found in what constellation?*
A. Orion
B. Pegasus
C.Aquarius
D. Ursa Major
*3. Which of the following is not a constellation?*
A. Horologium
B. Microscopium
C. Telescopium
D. Trapezium
*4. How often does sunspot activity reach its lowest point?*
A. 10.6 Years
B. 11.3 Years
C. 12.1 Years
D. 11.9 Years
*5. After the Centauri system, what is the next farthest star
from our sun?*
A. Wolf 359
B. Barnard's Star
C. Vega
D. Sirius A
*6. Who discovered the supernova and was the first to
theorize that stars "die"?*
A. Galileo Galilei
B. Nicolas Copernicus
C. Tycho Brahe
D. Johannes Kepler
*7. Which tiny moon orbiting the asteroid Ida was discovered
in 1994?*
A. Icarus
B. Dactyl
C. Eros
D. Deimos
*8. How many rings does the planet Saturn have?*
A. 4
B. 13
C. 3
D. 7
*9. What scientist discovered that sunspots occur in an
eleven-year cycle?*
A. Kepler
B. Brahe
C. Galileo
D. Newton
*10. What is the 6th planet from the sun in our solar
system?*
A. Venus
B. Uranus
C. Saturn
D. Jupiter
*11. What type of object does the "no-hair" theory
describe?*
A. Asteroid
B. Comet
C. Black Hole
D. Meteor
*12. What is it called when the Earth, Sun and Moon lie in a
straight-line configuration?*
A. Triclips
B. Equinox
C. Syzygy
D. Lineruper
*13. The term, "black hole", was named by American
physicist, John Wheeler, in which year?*
A. 1927
B. 1947
C. 1957
D. 1967
*14. What does the color of a star indicate?*
A. Size And Distance
B. Age And Distance
C. Distance And Temperature
D. Temperature And Age
*15. The Sun's mass is approximately how many times as great
as Earth's?*
A. 10,000 Times
B. 330,000 Times
C. 800 Times
D. 1 Million Times
1) C
2) A
3) D
4) D
5) B
6) C
7) B
8) D
9) D
10) B
11) C
12)
13) A
14) D should it be All above?
15) B
----------------------------------------------------------------------------
*QUIZ of the DAY*
*1-The Hottest Layer of Earth's atmosphere is?*
a) Thermosphere
b) Mesosphere
c) Exosphere
*2-The Duration of a year is 365 days. If Earth was 2 times
heavier, How long would be the duration of a year?*
a) 730 days
b) 365 days
c) 183 days
*3-A meteor will burn up more rapidly in Mars' atmosphere
than in Earth's atmosphere*
a) True
b) False
*4-How large would a bucket of water have to be to put out
the sun?*
a) Bucket Size of Sun
b) Bucket Size of Moon
c) It would make it Burn More
*5-Would a guitar sound the same on a space station?*
a) Yes
b) No
*6-A star that pulsates radially, changing both diameter and
temperature is called a*
a) Quasars
b) Magnetars
c) Cepheid
*7-Scientists believe the Crab nebula is the remains of?*
a) a black hole
b) a star which suffered a supernova explosion
c) a galaxy
*8-The mass of Jupiter can be calculated by*
a) Knowing the Sun's mass and measuring the average distance
of Jupiter from the Sun
b) Measuring the orbital speed of one of Jupiter's moons
c) Measuring the orbital period and distance of one of
Jupiter's moons
*9-What kind of thermal radiation does the Earth emit?*
a) Visible light
b) Infrared light
c) ultraviolet light
*10-What atmospheric constituent is responsible for the blue
color of Uranus and Neptune?*
a) Methane
b) Water
c) Ammonia
*ANSWERS*
*1-a*
Thermosphere - It is very much hotter than other layers as it
is directly exposed to energetic radiations coming from Sun
*2-b*
365 days - The Time period of revolution of Earth depends
only on distance of Earth from Sun and Mass of Sun.
*3-b*
False - Since Mars atmosphere is thinner than Earth's there
would be less frictional heating & the Meteor would burn Slowly as compared
to Earth's atmosphere.
*4-c*
No amount of water thrown on the sun would cause it to go
out. Instead, any amount of water would cause the sun to burn even more. The
burning of the sun is nuclear fusion, not chemical combustion. Campfires and
candle flames are examples of chemical combustion.
*5-a*
Yes - Yes. Since a space station typically contains regular
air at normal pressure in order to keep the humans comfortable, the sounds
created by playing a guitar will be the same as on earth.
*6-c*
Cepheid - A Cepheid variable is a type of star that pulsates
radially, varying in both diameter and temperature and producing changes in
brightness with a well-defined stable period and amplitude.
*7-b*
The Crab Nebula (Messier 1), located in the constellation of
Taurus, is a supernova remnant (SNR), the result of a cataclysmic supernova
explosion.
*8-a & c*
The mass of Jupiter can be calculated by. A. Knowing the
Sun's mass and measuring the average distance of Jupiter from the Sun and also
If a planet has an observable moon (or moons), astronomers can figure out the
mass by analyzing measuring the orbital period and distance of one its moons.
*9-b*
Infrared - Once in the Earth's atmosphere, clouds and the
surface absorb the solar energy. The ground heats up and re-emits energy as
longwave radiation in the form of infrared rays.
*10-a*
Methane - Both planets's atmosphere is made up of hydrogen,
helium and methane. The methane in Neptune's upper atmosphere absorbs the red
light from the sun but reflects the blue light from the Sun back into space.
This is why they appear blue.
-------------------------------------------------------------
*QUIZ*
*1-Suppose you are an astronaut in space, hard at work in
your sealed spacesuit. The only way that you can transfer heat to the
environment is by:*
a) Conduction
b) Convection
c) Radiation
d) Evaporation
*2-How was the Speed of Light First discovered /Determined?*
a) By Observing Eclipse of Moons of Jupiter
b) Using Lasers and Mirrors
c) By Studying Movement of Stars
*3-why do any free-moving liquid in outer space form itself
into a sphere?*
a) Due to Low Gravity
b) Due to Surface tension
c) Due to its nature
*4-What if the mass of the sun were doubled..?*
a) you would weigh double on earth
b) Earth would fall out of the habitable zone
c) fusion reaction that powers the sun would stop
*5-What would happen if space was filled with air?*
a) you would hear Sound of Burning Sun that would turn you
deaf
b) Moon would spiral inward, crashing earth
c) The mass of Universe would far exceed the theoretical
limit
*6-Originally, the nuclear fusion recations occuring inside
Sun's core produce Light in which form?*
a) UV rays
b) Gama Rays
c) Radio Waves
*ANSWERS*
*1-c*
In space there is no matter. Both conduction and convection
require matter to transfer heat. Radiation as means of heat transfer does not
require any medium and there is no exchange of mass.
*2-a*
Danish astronomer Ole Roemer measured the speed of light by
timing eclipses of Jupiter's moon Io.
*3-b*
The tendency for water molecules to stick together causes it
to causes spheres in space. Earth's gravity pulls the liquid downward into the
shape of the container it's in. ... In space surface tension shapes water into
spheres.
*4-b*
The sun would be two solar masses. It would then output 20
times the Sun’s luminosity, The Earth would be getting 27,500 watts per square
meter worth of energy. This energy is 3 times the energy received at Mercury
orbiting a normal sun, so within a few seconds mostly all flammable materials
would be on fire. People would also burn to death.
*5-a,b,c*
yes all the three are correct
we’d be able to hear the Sun. It would be pretty deafening,
The air would cause significant drag on the motions of the
moon, Our Moon would spiral inward, eventually crashing into Earth.
As space is very huge & empty, if it were filled with
air, The mass of such a thing would far exceed the theoretical limit for
supermassive black holes.
*6-b*
The Sun produces gamma rays all the time in its core. But
these collide so often with hydrogen atoms, they get split into much lower
energy photons by the time they reach the surface where we see lots of visible
light, peaked in the yellow.
---------------------------------------------------------
---------------------------------------------------------
No comments:
Post a Comment