ASTRO Review

If a star is being observed from Earth and it's light has shifted towards the blue side of the electromagnetic spectrum it would be...

• Moving towards the Earth
• Moving away from the Earth
• This is a trick question that cannot be answered
• It isn't a star, it is a very large blueberry.

If a star is being observed from Earth and it's light has shifted towards the red side of the electromagnetic spectrum it would be...

• Moving towards the Earth
• Moving away from the Earth
• This is a trick question that cannot be answered
• It isn't a star, it is a very large blueberry.

All electromagnetic waves travel at 

• Speed of Sound
• the Speed of Light
• the speed of gravity
• no idea

Which section of the spectrum is the ONLY one we can see?

• X-rays
• Visible Light
• Gamma Rays
• Ultraviolet Rays

All of the evidence that scientists collect suggest that the Big Bang occurred approximately how long ago?

• 4.6 billion years ago

• 13.7 billion years ago

The majority of matter in the universe is made of which two elements that formed shortly after the Big Bang?

• Oxygen and Helium
• Nitrogen and Carbon
• Hydrogen and Helium
• Lithium and Oxygen

According to the Big Bang theory, immediately after the big bang, the universe began to

• cool down
• shrink
• heat up
• Condense

Use the image to identify the motion of the object relative to Earth.  Compare the absorption spectra of the star to what the star would look like if it were not moving at all relative to Earth.

• It is not moving
• It is moving away from Earth (Redshift)
• It is moving towards Earth (Blueshift)
• It is moving towards Earth (Redshift)

Are any of the galaxies moving towards Earth?  Explain.

• A.  It is redshifted
• B. It is redshifted.
• C. It is blue shifted.
• A. It is blueshifted.

Based on  Doppler effect, which of the galaxies is moving away from Earth?

• A
• B 
• C
• A and B