| A | B |
|---|
| heliocentric | a description of the solar system in which all of the planets revolve around the sun |
| inertia | the tendency of a moving object to continue in a straight line or a stationary object to remain in place, Newton's 1st Law |
| nuclear fusion | source of the sun's energy where hydrogen atoms join together to form helium, releasing energy |
| core | the central part of the sun, where nuclear fusion occurs |
| photosphere | the inner layer of the sun's atmosphere |
| chromosphere | the middle layer of the sun's atmosphere |
| corona | the outer layer of the sun's atmosphere |
| solar wind | a steam of electrically charged particles produced by the sun's corona |
| solar flares | an explosion of hydrogen gas from the sun's surface that occurs when loops in sunspot regions suddenly connect |
| prominences | a loop of gas that protrudes from the sun's surface, linking parts of sunspot regions |
| gravity | pulling force of objects on each other |
| gravity & inertia | work together to keep planets in orbit around the sun |
| stronger gravity | greater mass and closer together of the object |
| weaker gravity | smaller mass and objects are farther apart |
| elliptical | shape of the planets orbits |
| constellation | pattern formed by a group of starts |
