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Topic 11
Term | Definition |
---|---|
Satellite | An object that orbits a planet |
Star | giant balls of hot gas made of hydrogen & helium |
Constellation | pattern or group of stars that people-thought represents, animal orobject. |
Geocentric | Earth is at the center of the revolving planets & stars |
Heliocentric | Earth and other planets revolve around the sun. |
Ellipse | An oval shape which may be elongated or nearly circular, the shape of the planet orbits |
Rotation | spinning of Earth on its axis |
Revolution | Movement of one object around another |
Solstice | sun appears farthest north of equator once a year |
Equinox | noon sun is directly overhead at equator, rises due east and sets due west.... Means “equalnight” |
Gravity | force which attracts all objects to ward each other |
Law of universal gravitation | every object in universe attracts another object. |
Inertia | when object resists change in motion |
Eclipse | The partial or total blocking of one object in space by another |
Umbra | The darkest part of the shadow |
Penumbra | eclipse shadow that is dark, but not as dark as the umbra portion |
Tide | rise & fall of the ocean water that occur every 12.5 hrs. |
Spring tide | largest difference between high & low tide |
Neap tide | Sun--- Moon---- Earth (all in a row-during new moon & full moon tide |