Astronomy A.7-A.11 Unit Post Test

Which description is considered most accurate regarding what actually happened during the Big Bang?

• Two galaxies collided causing an immense explosion as stars crashed into one another

• All of what would become the universe was concentrated in a single small point, or singularity, which rapidly expanded into what is now stars, planets, galaxies, matter, and energy.

• All matter emerged from a massive black hole at the center of the universe.

• Parts of the sun were ripped off by massive internal explosions and were thrown into space where they cooled to become other things, like plants, comets, and other galaxies.

The Big Bang Theory is the most widely accepted theory about the origin of the universe.

• true

• false

Which of the following is evidence of the Big Bang Theory?

• Cavemen heard a loud bang at the beginning of time.
• The universe isn't moving
• The universe is expanding
• The universe is getting smaller

If something that makes light is moving AWAY from you, it spreads the wavelengths of light out. This application of the Doppler effect is known as ___.

• blue shift

• green shift

• red shift

• black shift

Most stars are made of which gases?

• Hydrogen only
• Hydrogen and Lithium
• Hydrogen and Sodium
• Hydrogen and Helium

When a nebula heats up, a "baby" star forms in the middle. It is called a

• supernova
• supergiant
• white dwarf
• protostar

As a whole, Giants are considered hotter than White Dwarfs.

• True
• False

Blue stars are the _____________.

• hottest
• coolest
• smallest

What has to happen for a black hole to form?

• A planet must collapse inward on itself

• A galaxy must spin extremely fast around its center

• A large star or group of starts must collapse

• Two stars must collide with one another

What might happen if you got too close to the center of the Milky Way galaxy?

• You would be burned up by the galaxy's brightest stars.

• You would be spun outwards toward the edge of the galaxy.

• You would be trapped in the gravitational pul of a black hole.

• You would find yourself traveling faster than the speed of light.