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21 Cards in this Set
- Front
- Back
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2 examples of optical telescopes
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refracting and reflecting
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Radio telescopes
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have a large curved reflecting surface to focus radio waves from distant objects
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How do astronomers measure how much the nearby star appears
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how it moves against the background of stars that are much farther away
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The less the nearby star appears to move, the__________ it is.
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farther away
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1 ligth year=
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9.46 trillion km
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Characteristics to classify stars
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color
temp. brightness Size Composition |
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The coolest stars are
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red
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The hottest stars are
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blue
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Most stars are smaller than our
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sun
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Spectograph
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a device that breaks light into colors & produces an image of the resulting spectrum
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Absolute brightness of a star depends on
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size and temp
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More than 90% of all stars including the________, are main sequence stars
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sun
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All stars begin their lives as
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nebulas
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A_______________ forms and nuclear fusion begins
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protostar
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WHat happens to a star when it begins to run out of fuel?
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core shrinks
outer portion expands |
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It will either become a_____________ or a ________________
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1. red giant
2. supergiant |
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3 possible endings for a star
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White Dwarf
Neutron Star Black Hole |
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The blue-white core that is______________ is a white dwarf.
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left behind
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The explosion of a supergiant
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supernova
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The formed remains of a high-mass star
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Neutron Star
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High Mass =
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High gravity
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