| A | B |
|---|
| light year | distance light travels in 1 year |
| light year | about 5.9 trillion miles |
| speed of light | 186,000 miles per second |
| planets | orbit the sun |
| planets | have a clear path in its orbit |
| planets | round due to its own gravity |
| star | ball of exploding hot gas |
| orbit | path object takes as it goes around another object |
| constellation | group of stars that make a shape |
| satellite | anything that orbits a planet |
| comet | ball of ice & dust |
| comet | orbits the sun & has a long trail of light |
| asteroid | large space rocks that orbit the sun |
| meteoroid | chunk of rock in space |
| meteor | rock that enters Earth's atmosphere & burns up |
| meterorite | rock from space that hits the Earth |
| hemisphere | 2 parts when sphere is cut in half |
| axis | imaginary line, runs from North pole to South pole |
| equator | imaginary line, separates northern and southern hemisphere |
| inner planets | Mecury, Venus, Earth, Mars |
| outer planets | Jupiter, Saturn, Uranus, Neptune |
| our galaxy | milky way |
