| A | B |
|---|
| Nebula | Spinning cloud of hot gases |
| Orbit | Curved path of one object around another object in space. |
| Solar System | The sun and all the objects that orbit the sun. |
| Aphelion | The point in a planet's orbit at which it is farthest from the sun. |
| Ellipse | A flattened circle or oval |
| Perihelion | The point in a planet's orbit where it is closest to the sun. |
| Gravity | The force of attraction that exists between al objects in the universe. |
| Satellite | A natural or artificial object orbiting a body in space. |
| Craters | Round holes on the moon's surface. |
| Mar / Maria | Broad, flat plains on the moon. |
| What are the inner planets? | Mercury, Venus, Earth, and Mars |
| Which par the Jovian planets? | Jupiter, Saturn, Neptune, and Uranus. |
| What is the largest planet in our solar system? | Jupiter |
| What is the second largest planet in our solar system and the least dense? | Saturn |
| Which planet is the seventh from the sun and the third largest? | Uranus |
| Which planet is the eighth from the sun and similar in size and mass to Uranus? | Neptune |
| Which planet is considered the smallest in our solar system? | Pluto |
| Asteroid | Large chunk of rock that orbits the sun. |
| Comet | A body made up of rock, dust, gases, and ice that orbits the sun. |
| Meteor | A piece of rock or metal that enters the earth's atmosphere. |
| Meteorite | A piece of rock or metal that hits the earth's surface. |
| Meteroid | A piece of rock or metal that orbits the sun. |
| What is the third planet from the sun? | Earth |
| What are the parts of a comet? | Nucleus, coma, and tail. |
| What are the two gases that make up most of Jupiter? | Hydrogen and helium |
| What planet is known for it's Great Red Spot? | Jupiter |
| Which planet is closest to the sun? | Mercury |
