Answers Earth and Space qtr 1The Expanding Universe

The Expanding Universe Answers

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

dark energy

the age of rocks on Earth

the current motion of inner planets

patterns of background radiation

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Which evidence supports the big bang theory?

Planetesimals form in debris disks.

Most galaxies are moving toward us.

Uniform background radiation is detected in every direction.

Galaxies spin faster than they should based on visible matter.

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

Galaxies exist outside of the Milky Way.

The expansion of the universe is accelerating.

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

Gas giants form farther from the Sun, where temperatures are cooler.

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?

Background radiation is present.

Galaxies exist outside of the Milky Way.

The expansion of the universe is accelerating.

Gas giants form farther from the Sun, where temperatures are cooler.

Which is currently the most supported theory about the future of the universe?

The universe could remain exactly as it is today.

The universe may continue to expand.

Stars could burn out, causing the universe to become dark and cold.

Gravity could pull galaxies back together, causing a reverse of the big bang.

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

The solar nebula became hot and dense pulling in more gas.This flattened into a rotating disk. It spun faster and faster, forming the Sun.

Gas was pulled toward the center, forming the Sun. Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster.

Gas flattened into a rotating disk and became hot and dense, forming a solar nebula that spun faster and faster. Gas was pulled toward the center, forming the Sun.

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.

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

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

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

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

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

Which statement accurately describes dark matter?

It is the same as dark energy.

It is well understood by scientists.

It does not emit electromagnetic radiation.

It can be observed by shifts in red and blue light.

What happens in the process of gravitational condensation?

An object decreases in size due to the collision of materials.

An object increases in size due to the addition of materials.

Gas particles are formed from solar nebula materials.

Solid particles are formed from solar nebula materials.

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

About 5 million years ago

About 14 million years ago

About 5 billion years ago

About 14 billion years ago

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