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17 Cards in this Set
- Front
- Back
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Univwerse
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the sum of all matter and energy that exists, that ever has existed, and that ever will exist
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Star
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a huge ball of hot gas that emits light
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Galaxy
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a collection of millions or billions fof stars that bound together by gravity
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Light year
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a unit of distance equal to the distance light travels in one year; 1 ly=9.5 X 10 to the 15th m power
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Interstellar matter
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the gas between the stars in a galaxy
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Red shift
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a shift toward the red end of the spectrum in the observed spectral lines of stars or galaxies
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Big bang theory
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a scientific theory that states that the universe began 10 billion to 20 billion years ago in an enormous explosion
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Constellation
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a group of stars appering in a patter as seen from Earth
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Red Giant
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a large, reddish star late in its life sycle that fuses helium into carbon or oxygen
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Whit dwarf
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a small, very dense star that remains after fusion in a red giant stops
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Supergiant
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an extremly large star that creates elements as heavy as iron
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Supernova
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a powerful explosion that occurs when a massive star dies
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Neutron star
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a dead star with the density of atomic nuclei
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Black hole
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an object so massive and dense that not even light can escape its gravity
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Planet
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any of the nine primary bodies orbiting the sun; a similar body orbiting another star
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Nebular model
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a model that describes the sun and the solar system forming together out of a cloud of gas and dust
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Phases
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the different apparent shapes of the moon or a planet due to the relative positions of the sun, Earth, and the moon or planet
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