| A | B |
|---|
| geocentric | Earth at the center |
| heliocentric | Sun at the center |
| eliptic plane | Almost circular plane |
| moon | small natural body that revolves around a planet |
| astronomical unit (au) | average distance from Earth to Sun (about 150,600,000 km) |
| space probe | unmanned vehicle that transmits data in space |
| Spring tides | Greates change from high to low tide |
| Neap tides | least change from high to low tide |
| solar eclipse | Eclipse with moon between the Sun and Earth |
| lunar eclipse | Eclipse with Earth between the Sun and moon |
| prominences | large loops of gas that erupt on the surface of the Sun |
| solar flairs | Dramatic eruptions on the surface of the Sun |
| dark matter | material that doesn't give off detectable radiation |
| Big bang theory | Billions of years ago a HUGE explosion started the Universe |
| Hubble's Law | Direct variation of speed a galaxy is moving from the Earth to it's distance from it. |
| Red Shift | The shift towards longer wavelengths of light of galaxies moving away from the Earth |
| corona | The part of the Sun that you can see during a lunar eclipse |
| solar winds | streams of charged particles that go from the Sun into outer space. |
| sun spots | areas on the Sun that are cooler than the surrounding area |
| core | the center of the sun |
