AnswersFL-2001010-MJ EarthSpace Science AThe Expanding Universe

The Expanding Universe Answers

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1
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Which two objects in space formed from the huge disk of ice and debris beyond the outer planets?

A
Pluto and comets
B
comets and Neptune
C
Neptune and a solar nebula
D
a solar nebula and planetesimals
2
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Which statement accurately describes how the understanding of the Doppler effect is applied to the study of galaxies?

A
It helped Hubble measure the velocities of galaxies using shifts in light.
B
It was used to monitor galaxy motion through changes in sound waves.
C
It indicates a galaxy moving toward Earth through red shift.
D
It indicates a galaxy moving away from Earth through blue shift.
3

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

A
Masses of matter form around dust grain, masses of matter collide, and atoms and molecules are added to dust grain.
B
Masses of matter collide, masses of matter form around dust grain, and atoms and molecules are added to dust grain.
C
Atoms and molecules are added to dust grain, masses of matter form around dust grain, and masses of matter collide.
D
Masses of matter collide, atoms and molecules are added to dust grain, and masses of matter form around dust grain.
4

Which statement accurately describes dark matter?

A
It is the same as dark energy.
B
It is well understood by scientists.
C
It does not emit electromagnetic radiation.
D
It can be observed by shifts in red and blue light.
5

In 1998, scientists discovered that the expansion of the universe has been accelerating.What force is causing this phenomena?

A
dark energy
B
Hubble’s law
C
the Doppler effect
D
background radiation

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