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10 Cards in this Set
- Front
- Back
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Characteristics used to classify stars include _, _, _, _, and _.
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color, temperature, size, composition, and brightness.
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Astronomers often use ____ to measure distances to nearby stars.
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parallax
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A light-year is the distance that light travels in one year, about _._ million million _____.
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9.5
kilometers |
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Astronomers use H-R diagrams to ___________________________ ___________________________.
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classify stars and to understand how stars change over time.
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A star is born when...
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the contracting gas and dust from a nebula become so dense and hot that nuclear fusion starts.
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How long a star's life is depends on its...
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mass.
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All stars begin their lives as parts of ______.
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nebulas.
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T or F: Stars with more mass last longer than stars with less mass.
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False.
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After a star runs out of fuel, it becomes a _, _, or _.
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white dwarf, a neutron star, or a black hole.
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Astronomers classify most galaxies into three main categories
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spiral, elliptical, and irregular.
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