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22 Cards in this Set
- Front
- Back
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Define Nova.
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Nova Star is a star that suddenly grows hundreds or even thousands of time brighter then fades to far less than it was to begin with.
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What are the three main sizes of stars?
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1. Dwarf
2. Giant 3. Supergiant |
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What are all stars made of?
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Stars are made of gas, mostly hydrogen, which changes to helium.
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Which is larger--the sun or Betelgeuse?
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Betelgeuse
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Give me an example of a super-super giant.
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VV Cephei
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Define Apparent magnitude.
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Apparent magnitude is how bright a star appears to be as seen from the earth.
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Explain Hipparchus's scale.
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Hipparchus's scale ranges from negative numbers for the brighter stars to positive numbers for the dimmer stars.
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What kind of star is Betelgeuse?
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Betelgeuse is a supergiant.
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Define Absolute Magnitude.
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Absolute Magnitude is how bright a star actually is.
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Define Dwarf star.
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Any star of average or small size is a dwarf star.
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How many stars do you think there are?
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There are more than 100 billion stars.
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What three characteristics affect the brightness of stars?
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1. Its distance from the earth.
2. Its size. 3. Its temperature. |
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Why does the sun appear brighter than the other stars?
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The sun is closer to the earth than the other stars.
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Which is closer to the earth--the sun or Betelgeuse?
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The sun.
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How do you think our sun would look from Betellgeuse?
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If the sun could be seen at all, it would look extremely small.
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Are all stars suns?
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Yes
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What is a giant star?
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A giant star is a large star that is hundreds of times brighter than the sun.
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How far away is Betelgeuse from the earth?
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Betelgeuse is 527 light-years from the earth.
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Define Variable Stars.
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Variable stars are stars that flare up brightly, grow dimmer, and flare up again.
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What kind of star is our sun?
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Our sun is a dwarf star
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What is the fourth category of stars?
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Super-super giant is the fourth category of stars.
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Who was Hipparchus?
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Hipparchus was a Greek who lived shortly before the time of Christ. He devised a system to classify stars by their brightness.
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