1. vocabulary

2.  Our solar system includes the sun, the planets and many smaller objects.

3.  The inner planets are the four planets nearest to the sun.  Mercury  Venus  Earth  Mars

4.  The outer planets are the four planets farthest from the sun.  Jupiter  Saturn  Uranus  Neptune

5.  A satellite is a smaller body that revolves around a larger body.  The moon is a natural satellite of the Earth.

6.  A comet is a body of ice, rock and dust that was formed in the cold outer solar system and orbits the sun.

8.  Asteroids are small rocky bodies that orbit the sun, found mainly in the asteroid belt between Mars and Jupiter.

10.  A meteoroid is a rocky body smaller than an asteroid. Meteors burn up in Earth’s atmosphere. Meteorites do not burn up entirely and strike the ground.

13. Relative distances

14.  A U = the average distance of Earth from the sun  AU=149,600,000 kilometers  AU=92,957,000 miles

15.  Sun 0.0 AU  Mercury 0.4 AU  Venus 0.7 AU  Earth 1.0 AU  Mars 1.5 AU  Asteroid Belt 2.8 AU  Jupiter 5.2 AU  Saturn 9.6 AU  Uranus 19.2 AU  Neptune 30.0 AU

16. Sun =0 cm Mercury =4 cm Venus =7 cm Earth =10 cm Mars =15 cm Asteroid Belt =28 cm Jupiter =52 cm Saturn =96 cm Uranus =192 cm Neptune =300 cm