Science Study Guide Chapter 7

1. rotate 2. planet 3. asteroids 4. axis 5. crater 6. constellation 7. comets 8. orbit 9. revolve 10. star

11. one year 12. the rotation of the Earth 13. rocky, small, warmer, and closer to the Sun 14. Jupiter and Saturn 15. New Moon 16. The tilt of the Earth 17. It is reflected from the Sun, it does not come from the Moon. 18. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune

20. The further the planet is from the Sun the longer its year, because it has to travel a longer path. 21. The moon is dusty and lifeless. There is no water or air. It is very hot during the day and very cold at night. The Moon is covered by craters, mountains, and large flat plains. 22. The Sun is an average star. It appears bigger and brighter than any star because it is much closer to Earth. The Sun is made of gases. Hydrogen gas is the Sun’s fuel. The Sun’s heat and light come from this fuel.

23. The footprints will last a very long time, because there is no air or water to blow the dust or wash it away. The footprints will stay unless a rock from space hits the Moon at that location.