The Expanding Universe

Question 1

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 2

What would most likely cause the future acceleration of the expansion of the universe?

Revolt · Accepted Answer

the continued existence of dark energy

Question 3

What happens in the process of gravitational condensation?

Revolt · Accepted Answer

Solid particles are formed from solar nebula materials.

Question 4

Which statement accurately describes the inner planets?

Revolt · Accepted Answer

The inner planets are also called terrestrial planets.

Question 5

Which is one piece of information that astronomers use to calculate the age of the universe?

Revolt · Accepted Answer

patterns of background radiation

Question 6

What is the correct order of processes in the accretion of planetesimals?

Revolt · Accepted Answer

Atoms and molecules are added to dust grain, masses of matter form around dust grain, and masses of matter collide.

Question 7

Which statement accurately describes planetesimals?

Revolt · Accepted Answer

They are the origins of planets.

Question 8

Which evidence supports the big bang theory?

Revolt · Accepted Answer

Uniform background radiation is detected in every direction.

Question 9

Which event led to the formation of our solar system?

Revolt · Accepted Answer

A solar nebula collapsed.

Question 10

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.

The Expanding Universe Answers

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