Answers2001310 Earth Science Sem 1 - PearsonThe Expanding Universe

The Expanding Universe Answers

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Imagine you are an astronomer who recently discovered a new planet orbiting a distant star.Which set of characteristics would you use to classify this planet as an inner or terrestrial planet? Check all that apply.dense and solidvery largethick atmosphere containing hydrogen and heliumlacking a solid surfacelocated near a star

A
dense and solid
B
very large
C
thick atmosphere containing hydrogen and helium
D
lacking a solid surface
E
located near a star
2
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Why is Jupiter so much larger than Earth? Check all that apply.

A
Inner planets were created at higher velocities.
B
Outer planets have less gravity than inner ones.
C
Outer planets attracted helium, hydrogen, and other gasses.
D
Inner planets formed where temperatures were cooler.
E
Gases escaped from inner planets and not from outer ones.
3

Which statements explain current theories about dark energy and dark matter? Check all that apply.

A
Space that appears empty actually contains dark energy and dark matter.
B
Dark matter does not emit electromagnetic radiation.
C
Scientists believe dark energy will cause the universe to collapse inward to a single point.
D
Scientists theorize that dark energy is causing the expansion of the universe to accelerate.
E
Dark matter includes all of the dust, ice, and debris that scientists observe in black holes.
4

Which hypothesis is most supported by astronomers?

A
The universe is currently expanding and will continue to expand.
B
Stars could burn out, causing the universe to become dark and cold.
C
Gravity could pull galaxies back together, causing a reverse of the big bang.
D
Dark energy will pull the universe together to form a massive black hole.
5

Which statements describe processes involved in the accretion of planetesimals and protoplanets? Check all that apply.

A
Both involve the melting of solid materials in the nebula.
B
Both involve the formation of solid particles from nebular materials.
C
Both involve the work of the gravitational push on nebular materials.
D
Both involve the trapping of gases and the clumping of masses of matter.
E
Both involve the growing of gas grains with the addition of atoms and molecules.

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