| A | B |
|---|
| solar | to do with the sun |
| universe | all of the galaxies |
| galaxy | a group of stars like the Milky Way |
| orbit | path around an object |
| asteroid | rocks and metal that orbit |
| atmosphere | layer of gases surrounding a planet |
| astronomer | scientist that studies stars and planets |
| Big Bang | explosion that began the planets |
| comet | dirty ice |
| meteor | shooting star |
| meteorite | meteor that hits the Earth |
| planet | rocks, gas, and liquid that orbits a star |
| year | time it takes to go around a star |
| star | flaming gas |
| day | one rotation |
| sun | our nearest star |
