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13 Cards in this Set
- Front
- Back
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Heliocentric |
The model in which Earth and planets revolve around the sun at the center of the solar system. |
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Geocentric model |
A model where Earth was surrounded by a series of concentric spheres that represented the paths of the sun, moon and 5 planets. |
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Solstice |
When the sun reaches it's highest or lowest point in the sky at noon. Occurs two times in a year. |
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Equinox |
When the sun crosses the equator day and night of equal length. Happens two times a year spring or autumn around March 21 & September 23. |
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Ellipse |
Oval formed around two foci. The orbital paths of planets travelling around the sun. |
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Light years |
The distance that light travels in 1 year. Used to measure distances between stars and galaxies. |
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Astronomical units |
A measure of distance used to describe the position of planets relative to the sun. Distance from the center of Earth to the center of the sun is 149 599 000 km |
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Why was the invention of the telescope important? |
It revolutionized astronomy. Viewing ability got better and the distance between objects in space became more obvious. |
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Nebulae |
Vast clouds of gas and dust in space where stars form. |
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Constellations |
Grouping of stars that form patterns in the night sky. (88 stars) |
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Interstellar Matter |
The gases and dust that exist in the space between stars. Some comes from exploding stars. |
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Nebulae |
Stars form in regions |
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Life cycle of star |
Nebula -> Massive star -> Red Giant -> Supergiant -> Supernova -> Neutron Star |
