Solar System Part 1 Unit Test Review

Drew wanted to make a model of part of the solar system. He decided to model the Sun and the orbits of the two closest planets to the Sun. However, when Drew showed his teacher his model, she noticed that there were a few errors. Which of the following is incorrect in Drew's model?

• Earth is shown as being the closest planet to the Sun.

• The shapes of the planets' orbits are incorrect.

• The model is not to scale because it shows the Earth as being larger than the Sun

• all of these

The diagram below shows one way to model the Solar System. What is a limitation of this model?

• It does not show the relative distance of each planet from the Sun.

• It does not correctly show the relative sizes of the planets.

• It does not correctly show the order of the planets.

• It does not include all of the major planets in the Solar System.

The Sun is a star. Scientists have explained that the reason the Sun looks larger than other stars is that the Earth is much closer to the Sun than to other stars.

Lena has noticed some of the stars in the night sky look smaller than others.

What is the best prediction that Lena could make about the stars?

• The stars that look smallest are closest to the Earth.

• All stars are the same distance from the Earth.

• The stars that look largest are closest to the Earth.

• The stars that look largest are moving toward the Earth.

Planets and stars look very similar. How can people on Earth tell that planets and stars are different?

• There is no way to tell that planets and stars are different.

• Over time, planets and stars move differently in the sky.

• Planets move in the sky, but stars are always fixed.

• Planets never move, but stars rise and set.

Drew likes to watch the stars. He has noticed one star which seems to move differently than the other stars. A week ago it was closest to one star and now it is closest to a different star.

Why might Drew's star be moving differently than other stars?

• The star is really a planet.

• The star is really the Moon.

• The star is further away than other stars.

• The star is bigger than other stars.

Why do other stars appear so much dimmer than the Sun?

• The Sun is much brighter than all the other stars.

• The Sun is much hotter than all the other stars.

• All the other stars are much farther away from us than the Sun.

• All the other stars are much smaller than the Sun.

The surface of this planet appears red due to rusting iron in the rocks.

• Mercury
• Mars
• Pluto
• Venus

This is the largest planet in the solar system.

• Saturn
• Jupiter
• Uranus
• Venus

This is the smallest planet in the solar system

• Mercury
• Venus
• Earth
• Mars

Only planet known to have life

• Earth
• Mars
• Venus
• Mercury