Astronomy Review

Galaxies that are redshifted are:

• actually blue.
• really far away.
• invisible.
• moving away from us.

The CMB is:

• the remaining energy from the big bang.
• incredibly hot.
• visible to the human eye.
• only located in certain places in the universe.

Our theory of the universe was confirmed by the discovery of:

• fusion.
• cosmic microwave background radiation.
• the Andromeda galaxy.
• the Doppler effect.

Light waves that are stretched out by objects moving apart:

• have a shorter wavelength.
• travel faster than the speed of light.
• are invisible.
• appear more red.

The universe is ____________ years old.

• 8.13 billion
• 13.8 billion
• 1.83 billion
• 381 million

The most abundant element in the universe today is:

• water
• hydrogen
• oxygen
• carbon

What is true about these stars?

• Both of these stars are moving away from us.
• Both of these stars are moving towards us.
• Both of these stars are blueshifted.
• The star Sirius is closer to us.

The universe is expanding.  This means that:

• Galaxies are getting bigger.
• Atoms are getting bigger.
• The universe is creating more matter.
• The amount of space between galaxies is increasing.

The first element formed in our universe were...

• Oxygen and Iron

• Nickel and Gold

• Hydrogen and Helium

• Sodium and Zinc

Which is NOT true? Cosmic Microwave Background Radiation is...

• Is evidence for the Big Bang

• Is leftover energy from the start of the universe expansion

• Something that heats up our food

• Something that was first discovered by accident