Planetary Systems

2. A scientist who studies objects in the universe, including stars, planets, and moons
6. A large accumulation of tiny droplets of water, usually high in the air
9. Anything that has mass and takes up space
12. To bounce off an object or surface
14. A large, round object orbiting a star
15. The force of attraction between masses
16. The straight-line distance through the center of an object, one side to the other side
18. System The sun and the eight planets and other objects that orbit the Sun

1. The shape of the visible part of the moon
3. To move or travel around an object in a curved path (can also be a noun, the path traveled)
4. The layer of gases surrounding Earth. The layers include the trophosphere, stratosphere, mesosphere, thermosphere, and exosphere
5. Earth’s natural satellite
6. A hole formed by an object hitting a surface
7. A set of events or actions that repeat in a predictable pattern
8. To make an object appear larger
10. A group of billions of stars. Earth is in the Milky Way galaxy
11. An object, such as a moon, that orbits another object, such as a planet
13. Planets A round object that orbits the Sun and does not orbit a planet
17. To estimate accurately in advance based on a pattern or previous knowledge Stars