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S.E.M.
| Term | Definition |
|---|---|
| Rotation | The action of rotating around an axis or center. |
| Revolution | Going around something |
| Orbit | The curved path of a celestial object or spacecraft around a star, planet, or moon, especially a periodic elliptical revolution |
| Geocentric Theory | A theory that the Earth was the center of the universe |
| Heliocentric Theory | A theory that the Sun was the center of our solar system |
| Astronomy | The branch of science that deals with celestial objects, space, and the physical universe as a whole. |
| Solar System | Our solar system consists of an average star we call the Sun, the planets Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto. |
| Telescope | an optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses |
| Comet | a celestial object consisting of a nucleus of ice and dust and, when near the sun, a “tail” of gas and dust particles pointing away from the sun. |
| Gravity | the force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account |
| Astronomer | an expert in or student of astronomy. |
| NASA | |
| Axis | an imaginary line about which a body rotates. |
| Tilt | move or cause to move into a sloping position. |
| Meteors | |
| Constellation | |
| Vernal Equinox | |
| Autumnal Equinox | |
| Summer Solstice | |
| Winter Solstice |
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