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.

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 distant galaxies show a red shift. This is considered evidence that the universe is ___.

• getting cooler

• expanding

• condensing into a small point

• swirling around

The Big Bang Theory explains the formation of the...

• Earth

• Sun

• Universe

• Solar System

Nuclear fusion converts matter into energy

• true

• false

The matter between stars is called

• asteroid belt

• space

• interstellar medium

• Kuiper Belt

What does a light-year measure

• volume

• weight

• circumference

• distance

Stars form from ______________.

• nebula

• oxygen

• interstellar medium

• black holes

Which of the following hypotheses is written correctly?

• Frozen tennis balls will not bounce as high.
• If I heat up a tennis ball it will bounce high.
• If I freeze a tennis ball, then it will not bounce as high.
• If a tennis ball is frozen, then it won't bounce as high as one that is not frozen.

What step does every scientific experiment begin with?

• hypothesis
• question/problem
• procedures
• conclusion