Download Light travels 300,000 kilometers per second. The Moon is 384,000

Light travels 300,000 kilometers per second.
The Moon is 384,000 kilometers away from Earth.
When we look at the Moon, how old is the light we
are seeing?
A. About a second old
B. A few hours old
C. A few months old
The star Betelgeuse is about 400 light-years away.
If Betelgeuse were to explode today, how long
would it be until we saw the light of the explosion?
A. Just a few seconds
B. Nearly 8 minutes
C. About 400 years
D. About 400 light-years
The Universe is 13.7 billion years old.
Could we observe a galaxy that is 20 billion
light-years from us?
A. Yes, if we had a large enough telescope.
B. No, because its light is still travelling to us.
C. No. We cannot see outside of the Milky Way.
The Milky Way is about 100,000 light-years across.
(A good number to memorize!)
Estimate the size of the cluster of galaxies below:
A. Thousands of
light-years
B. Millions of
light-years
C. Billions of
light-years
How far is Earth from the Sun?
A. 1 million kilometers
B. 1 Astronomical Unit
C. 1 light-year
D. 1 parsec
How far are the outer planets (Uranus, Neptune)
from the Sun?
A. 20-30 million kilometers
B. 20-30 Astronomical Units
C. 20-30 light-years
D. 20-30 parsecs
How far apart are the Sun’s neighboring stars?
A. A few million kilometers
B. A few Astronomical Units
C. A few light-years
D. A few million light-years
How many stars are in the Solar System?
A. None
B. One
C. One million
D. One hundred billion
How many stars are in the Milky Way galaxy?
A. None
B. One
C. About a million
D. About a hundred billion
Does it make sense?
The Solar System is the same as the Milky Way.
A. Yes.
B. No.
Why or why not?
Does it make sense?
NASA soon plans to launch a telescope to take a
picture of the Milky Way from the outside.
A. Yes.
B. No.
Why or why not?
Does it make sense?
The Solar System is as old as the Universe.
A. Yes.
B. No.
Why or why not?
Does it make sense?
Photographs of distant galaxies show them as
they were long ago.
A. Yes.
B. No.
Why or why not?