Term
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Definition
Balance of gravity pushing inward and gas pressure pushing outward.
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Definition
Located in upper part of HR diagram
Stars that enter it are either Red Giants or Super Giants |
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Definition
| A star that has entered the Instability Strip and begun to pulsate |
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Term
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Definition
A group of stars created at the same time
Although, they are of different mass, and therefore, different life stages |
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Term
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Definition
-Clusters of about 1000 stars
-stars farther apart, younger, blue and bright
-example: 7 Sisters, or the Pleiades |
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Term
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Definition
-1,000,000 stars or more, closely together
-look like globs or cotton balls
-contain older stars |
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Term
2 Types of Variable Stars
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Definition
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Term
| Distance from Sun to center of galaxy |
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Definition
8000 parsecs
26,000 light years |
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Term
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Definition
Shaped like a bulge, bar
Sgr A at center
possibly a black hole
3.7 million times mass of the sun |
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Term
| size of bar in center of galaxy |
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Definition
| extends to about half the distance to our solar system |
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Term
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Definition
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Term
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Definition
M1 + M2 = a3/p2
A - AU distance from the center
P - Orbital period in years
M1 - mass of what you are going around
M2 - your mass
M (of galaxy) = a3/p2 |
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Term
| Mass of Milky Way using Kepler's 3rd Law |
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Definition
10 to llth solar masses
100 billion times the mass of the sun |
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Term
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Definition
| Area of congestion in our galaxy that moves independently and allows for spiral shape and formation of stars |
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Term
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Definition
studied andromeda galaxy during WW2
named stars in galaxies Population 1 and 2
Population 1 found in disc, young hot stars like the sun
Population 2 found in halo and disc, old red stars low in iron, have unstable orbits |
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