| Definition Match Solution |
| ellipse | oval |
| heliocentric | Sun-centered |
| kilometer | 1000 meters or 0.62 miles |
| aurora | a glow in a planet’s ionosphere |
| inferior planets | planets closer to the Sun than Earth |
| meteorite | an extraterrestrial rock found on Earth |
| light-year | the distance traveled by light in a year |
| comet | a bright streak of light caused by meteoroid |
| asteroid | a medium-sized rocky object orbiting the Sun |
| ionosphere | a region of charged particles in the upper atmosphere |
| Back to Definition Match |
| Unit | Learning Activities | Classification | Glossary | Worksheets |
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