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20 Cards in this Set
- Front
- Back
- 3rd side (hint)
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What is a star?
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A ball of gass that gives off electromagnetic electricity.
(nucuar fusion) |
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How does the color of stars seen from eart differ from their actua color?
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The actual color varies. Some are reddish or orange rather than the color we see them as, white.
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How do astronmers learn about stars?
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By analyzing the light that stars emit
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What are spectrographs?
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Devices that separate light into different colors
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Red
Orange Green Blue Indigo Violet |
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What does a stars dark lne spectrum reveal?
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The stars composition and temerature
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how it is broken down
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what do the colors and lines in the spectrum of a star indicate?
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The elements that make up a star and elements
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Most common element in stars?
Second most common? |
Hydrogen
Helium |
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less than 3500c
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red
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10000- 30000c
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white
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3500- 5000c
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orange
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5000- 6000c
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yellow
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7500- 10000c
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blue-white
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What is indicated by a stars color
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surface temperature
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What color are the coolest stars
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red
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Stars that are dense have more...
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mass than the sun and still be much smaller than the sun
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2 kinds of motion are associated with with stars
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actual motion and aparent motion
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What causes aparent motion of the stars which we see with our eye
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the movement of the earth
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In NH the movement of stars called circumpolar stars makes them appear..
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to circle polaris, the north star
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al visible stars in the North pole..
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are circumpolar
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3 types of actual motion that stars have
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rotate on axis, revolve around another star, either move away from or toward our solar system
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