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17 Cards in this Set
- Front
- Back
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Solar system |
Composed of a sun and the objects that travel around it |
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Nebulas |
Large interstellar clouds |
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Solar nebula |
The name of the nebula that formed our solar system |
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Planetesimals |
Tiny building blocks of the planets called planetesimals |
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Rotation |
Earth spinning on its axis |
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Orbit |
A planets path around the sun |
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Revolution |
The motion of a planet around the sun |
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Period of revolution |
The time it takes a planet to orbit the sun |
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Astronomical unit |
The average distance between earth and the sun |
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Nuclear fusion |
The process where two or more nuclei join together
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Sunspots |
Cooler dark spots on the sun |
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Chromosphere |
Thin layer below the corona |
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Corona |
The Suns outer atmosphere |
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photosphere |
The visible surface of the sun |
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Convective zone |
A region about 200,000 km thick where hot gases circulate in convection currents |
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Radiative zone |
A very dense region of the sun |
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Core |
Center of the sun |
