| Term | Definition |
|---|
| photosphere | the surface of the sun |
| corona | the sun's atmosphere |
| sunspots | dark spots on the sun that are cooler than the rest of the photosphere |
| solar flares | brief bursts of energy from the photosphere |
| solar wind | a fast-moving stream of particles thrown into space from the energy of solar flares |
| solar system | a group of objects that move around a central star |
| planet | a large object that moves around a star |
| asteroids | small rocky objects that orbit the sun in a belt between Mars and Jupiter |
| comet | a small mass of dust and ice that orbits the sun in a long, oval-shaped path |
| orbit | the path one body in space takes as it revolves around another body |
| law of universal gravitation | all objects in the universe are attracted to all other objects |
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