The Expanding Universe

Question 1

About how long ago did our solar system start to form?

Revolt · Accepted Answer

About 5 billion years ago

Question 2

Which discovery by astronomer Vera Rubin helped prove the existence of dark matter?

Revolt · Accepted Answer

Galaxies spin faster than they should, based on their visible matter.

Question 3

Which correctly lists the two elements that make up the empty space in the universe?

Revolt · Accepted Answer

dark matter and dark energy

Question 4

In which order did the events forming our solar system occur?

Revolt · Accepted Answer

The solar nebula spun faster and faster and flattened into a rotating disk. Most of the gas was pulled toward the center, where it became hot and dense, forming the Sun.

Question 5

Which statement accurately describes the outer planets?

Revolt · Accepted Answer

The outer planets have a high gravity due to their large size.

Question 6

There is a theory that gravity could pull galaxies back together, causing a reverse big bang.Which observation makes this theory less likely than the idea that the universe may continue to expand?

Revolt · Accepted Answer

The expansion of the universe is accelerating.

Question 7

What happens in the process of gravitational condensation?

Revolt · Accepted Answer

Solid particles are formed from solar nebula materials.

Question 8

Which event led to the formation of our solar system?

Revolt · Accepted Answer

A solar nebula collapsed.

Question 9

Which evidence supports the big bang theory?

Revolt · Accepted Answer

Uniform background radiation is detected in every direction.

Question 10

Which planet formed near the Sun where the solar system’s temperatures were very high?

Revolt · Accepted Answer

Mars

The Expanding Universe Answers

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