| A | B |
|---|
| Lunar Eclipse | When the Earth’s shadow blocks out the view of the moon |
| Solar Eclipse | When the Moon’s shadow blocks out the sun at a single location on Earth. |
| Doppler Effect | An apparent change in wavelength caused by a change in distance between two objects. |
| Red Shift | The shifting of visible light. Tells us that an object is going away from us. |
| Blue Shift | The shifting of visible light. Tells us that an object is moving towards us |
| Foucault Pendulum | A device which provides evidence that the Earth rotates |
| Ellipse | A closed curve around two paths. Planetary orbits are ellipses |
| Orbit | The path a planet takes around the Sun |
| Solar System | Made up of a star and all the objects that revolve around it |
| Asteroid | A solid rocky or metallic object that orbits the sun |
| Galaxy | A large grouping of stars |
| Geocentric | Model of the solar system where the Earth is the center |
| Heliocentric | Model of the solar system where the Sun is the center |
| Meteor | Small dust or rock particle that enters Earth’s atmosphere and burns up. Also called a shooting star or falling star |
| Luminosity | The brightness of an object |
| Universe | Everything that exists. |
| Revolution | The amount of time to go around the sun. |
| Rotation | Spinning on an axis |
| Celestial Object | Anything outside Earth’s atmosphere |
| Focus | A fixed point |
| Altitude | The angular distance of a celestial object about the horizon |
| Eccentricity | Out of roundness |
| Tides | Rising and falling of the oceans caused by the moon’s gravitational attraction to Earth. |
