The Big Bang Theory

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 Cosmic Background Radiation is:

• the remaining energy from the big bang.

• incredibly hot.

• visible to the human eye.

• only located in certain places in the universe.

The universe is ____________ years old.

• 8.13 billion
• 13.7 billion

• 1.83 billion
• 381 million

Most scientists believe the Big Bang Theory explains which of the following questions?

• How our planets and moons formed

• How our universe began

• How the sun turns hydrogen into helium

• How fast light travels through space