DIA 5 Review 3

Why do sunspots appear to move?

• Earth and the sun are both rotating at the same rate.

• Earth and the sun are both rotating at the same rate.

• Different parts of the sun rotate at different speeds.

What is the best explanation as to how the solar system formed.

• Gravity pulled the smaller particles together, forming larger particles

• Like materials combined forming larger particles.

• Electromagnetic radiation from the sun combined matter, forming larger particles.

• Oppositely charged particles came together, forming larger particles.

What keeps the planets in orbit around the Sun?

• The gravitational pull of the Sun

• The distance the planets are from the Sun

• The kind of orbit the planets have.

• Planets mass.

As a comet gets closer to the Sun it moves faster. Why?

• The mass of the comet increases.

• The gravitational pull is stronger

• The comet gets hotter

• There is more friction

If a star is 15 light-years from Earth it means that ________.

• It would take 15 years to reach in todays rockets

• It is 15 times as far as our Sun

• traveling at the speed of light, 300,000 km/sec, it would take 15 years to reach

• The star is 15 years old

Which is the farthest from the Earth

• The next planet

• The next closest galaxy

• The closest star (our Sun)

• The asteroid belt

Which of these is the largest?

• a star

• a nebula

• a planet

• a galaxy

This is a standardized unit used for comparing distances across the Solar System.

• meter

• AU - Astronomical Unit

• mile

• millimeter

Why does the Sun seem so big compared to other stars?

• Because it is much brighter than other stars

• Because it is much closer than other stars

• Because it is much hotter than other stars

• Because it is much bigger than other stars

What we see in this Hubble photograph is _______________ of the known Universe.

• a large part

• a tiny part

• most

• all