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10 Cards in this Set
- Front
- Back
Photosphere |
The visible part of the sun. |
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Corona |
The outermost layer of the sun's atmosphere. |
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solar flares |
Tremendous bursts of energy caused by magnetic stress within the sun. |
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Granules |
"Bubbles" that cover the surface of the photosphere. |
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a light-year |
The distance light travels in one year. |
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stellar parallax |
the angle that astronomers use to determine the distance to a star. |
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sunspots |
dark patches on the sun caused by the sun's magnetic field. |
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apparent magnitude |
brightness of a star as it appears to an observer on the earth. |
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supergranules |
larger-than-normal convection cells that cover the sun's surface and last from 12 to 24 hours. |
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transition region |
thin layer of the sun's atmosphere that releases ultraviolet radiation. |