| Term | Definition |
|---|
| Hydrogen | What kind of atoms do stars fuse to make helium? |
| Blue | What color are the hottest stars, such as Rigel? |
| 9.5 Trillion | About how many kilometers does one light-year equal? |
| Galaxy | A vast grouping of stars |
| Nebulas | Large clouds of dust and gas where new stars are born |
| Spiral Galaxies | Flat galaxies that include stars and nebulas (the milky was is an example) |
| Globular Clusters | Tight groups of stars in a halo around the Mily Way |
| Star Clusters | Stars that occur in small groups in galaxies |
| Light-Year | The distance that light travels in 1 year, about 9.46 trillion kilometers |
| Stars are made mostly of? | Hydrogen gas and helium gas |
| What is the sun mostly made of? | Hydrogen and helium |
| What did NASA's Mars rovers find out about Mars? | It once had liquid water |
| Asteroids | Small, cratered bodies that orbit the sun |
| Asteroid Belt | A region between the orbits of Mars and Jupiter |
| Comets | Small bodies of ice and rock that orbit the sun and form a flowing tail |
| Meteor | A birght streak of light (glowing trail) that results when a meteoroid burns up |
| Meteroid | A small, rocky body that travels through space |
| Meteorite | A meteoroid that reaches Earth's surface without burning up |
| What is produced when hydrogen atoms fuse to form helium? | The sun's energy, like the energy of others stars in our universe |
| The outer solar system | This is where are the largest bodies in the solar system found |
| What are the inner planets? | Mercury, Venus, Earth, and Mars |
| What are the outer planets? | Jupiter, Saturan, Uranus, and Neptune |
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