Space Systems Study Guide

How long does it take Earth to make one complete turn on its axis?

• 12 hours

• 24 hours

• 28 days

• 365 days

The sun is a star. Why does it look much bigger than the stars we see in the night sky?

• The sun is much bigger than any other star.

• The sun is much brighter than any other star.

• The sun is much closer to Earth than any other star.

Which of these is evidence of the force of Earth's gravity? Choose all correct answers.

• Raindrops fall to Earth from clouds.

• A helium balloon rises up into the air.

• A pebble sinks to the bottom of a pond.

• A basketball moves down through a hoop.

Choose the correct phrase to complete the following statement: The length of shadows changes throughout the day. This happens because (a)   .

• of the position of the sun
• of the weather conditions
• of the angle of the earth
• of the star patterns

Study the chart below. Which sentence best explains the pattern shown in the chart?

• The length of daylight changes as Earth rotates on its axis.

• The length of daylight changes as the sun revolves around Earth.

• The length of daylight changes as Earth revolves around the sun.

• The length of daylight changes as the moon revolves around Earth.

The sun is like all other stars in two ways. Which two are correct?

• It is a massive ball of gas undergoing nuclear fusion.

• It has a solid surface like planets.

• It emits or gives off light and heat.

• It revolves around the Earth.

Which image shows arrows correctly modeling the force of gravity on Earth?

• First

• Second

• Third

• Fourth

The picture shows one of Earth’s motions. Which things happen as a result of this motion? Choose all correct answers.

• Daylight changes to nighttime and back again.

• We see some stars only at certain times of year.

• The length of daylight changes throughout the year.

• The sun and the moon appear to move across the sky.

I can see the sun is close to the horizon in this picture. What predictions can you make about this person's shadow?

• His shadow will be long.

• His shadow will be short.

How would you change the picture to show the same scene at 3:00 p.m.?

• Move the sun to the right of the tree.

• Keep the sun in the same place.

• Move the shadow to the other side (East).

• Keep the shadow in the West.