Chapter 8 Lessons 3 & 4 Review

What did people thousands of years ago use to tell time? 13.

What are the hottest kind of stars? 9.

The four outer planets are made mostly of _________. 4.

Newton said the balance between what two forces keeps the planets in orbit around the Sun? 5.

What is the largest planet in the solar system? 6.

What revolves around the Sun in an orbit shaped like an ellipse? 1.

Mercury, Venus, Earth, and Mars are the closest to the Sun and are called the ______ _______. 3.

What planet has an atmosphere made up mostly of carbon dioxide? 7.

The night sky looks different in the ________ Hemisphere than it does in the ________ Hemisphere. 12.

What are smaller planets in the solar system called? 8.

Throughout the universe, stars are found in large groups called _____________. 10.

Scientists measure the distance of stars from Earth in __________. 11.

What kind of energy does the Sun give off that is useful for the Earth? 14.

In comparison to other stars, the Sun is what size? 15.

What makes faraway objects seem closer? 2.