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5 Cards in this Set
- Front
- Back
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How does a star start (and explain process) |
It starts from a mass of dust and gas in space (nebula). The mass has a large gravitational pull on itself and eventually it coalesces. If it has enough hydrogen and a high enough temperature, it can start fusing hydrogen into helium in its core. |
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Relate color of stars to their temperature. |
The cooler the star is, the redder it appears. The hotter a star is, the bluer it appears. |
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What is our Sun classified as on the HR diagram? |
a G2 classification main sequence star |
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How can a red supergiant be luminous? |
Even though it is red (and thus towards the less luminous side of the HR diagram), and gives off less heat per square meter, it has more total square meters because of its garagantuan mass. This means that it is luminous because it has more total mass than the other stars. |
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White Dwarf |
the end of expansion and contraction of a shrunken red giant. Eventually, it cannot get to the high temperatures needed to begin fusion, and it dies as a dwarf. |
