The three pieces of evidence for our current theory of the universe are:

• blueshift, CMB, moon landing.
• redshift, IBM, Andromeda galaxy.
• redshift, CMB, distribution of elements.
• doppler effect, light spectra, fusion.

Galaxies that are redshifted are:

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

The universe is expanding!  This means that:

• all of the galaxies are spreading out.
• the universe must have started from a single point.
• the universe is cooling down.
• all of the above.

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.

The only elements in the universe were hydrogen and helium until:

• the big bang.
• humans came along.
• stars began doing fusion.
• the redshift was discovered.

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.

CMB stands for:

• Colorful Mystic Background Rehearsal.
• Cosmic Mini Butterfly Repellent.
• Cosmic Microwave Background Radiation.
• Cute Microwave Button Reversal.

The temperature of the universe:

• is constant.

• varies between 20 to 6,000 degrees Fahrenheit.

• has increased to about 10,000 degrees Celsius.

• has cooled to about 2.7 Kelvin.

The universe is ____________ years old.

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