| A | B |
|---|
| comet | chunk of ice and dust that has a bright head and a long narrow tail |
| retrograde rotation | rotates east to west, Venus |
| Copernicus | developed sun-centered system of planets |
| Pluto and Charon | often considered double planets |
| sunspots | areas of gas on the sun that are cooler than the gases around them |
| Europa | one of Jupiter's moons that may have water beneath its icy surface that could support life |
| inertia | the tendency of an object to stay in motion or remain at rest |
| fusion | where the sun's energy comes from |
| prominences | loops of gas on the sun that link different parts of sunspot regions together |
| meteroids | usually come from comets or asteroids |
| Goldilocks Conditions | liguid water, appropriate temperature range, favorable atmosphere |
| Terrestrial planets | rocky surfaces |
| heliocentric | sun-centerd planets |
| elliptical | Kepler used Brahe's observations to show that the orbits are this |
| Gas Giants | Jupiter, Saturn, Uranus, Neptune |
| Greater mass | Greater Gravitational pull |
| solar wind | stream of particles that are produced by the sun's corona |
| asteroid belt | located between orbits of Mars and Jupiter |
| meteor | flash of light produced when a meteroid passes through Earth's atmosphere |
| solar flares | explosions on the surface of the sun |
| meteorites | meteroids that enterd our atmosphere and hit Earth |
