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18 Cards in this Set
- Front
- Back
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scientific notation
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simple way to write large numbers without many zeros (i.e.; 380,000 = 3.8 X 10^5)
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solar system
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consists of the sun, its family of planets, and some smaller bodies such as moons and comets
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planet
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small, non-luminous bodies that shine by reflected light
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star
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a self-luminous ball of hot gas that generates its own energy
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astronomical unit (AU)
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the average diistance from Earth to the sun, a distance of 1.5 X 10^11
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light-year (ly)
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the distance that light travels in one year, roughly 10^13 km, or 63,000 AU
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galaxy
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a great cloud of stars, gas, and dust bound together by the combined gravity of all matter (range from 1500 - 300,000 ly in diameter, can contain over 100 billion stars)
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Milky Way Galaxy
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our galaxy, which appears to us as a great, cloudy wheel of stars ringing the sky
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spiral arm
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our galaxy, like many others, had graceful _ _ winding outward through the disk. Stars are born in a great cloud of gas and dust as they pass through the _ _.
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scientific notation
|
simple way to write large numbers without many zeros (i.e.; 380,000 = 3.8 X 10^5)
|
|
|
solar system
|
consists of the sun, its family of planets, and some smaller bodies such as moons and comets
|
|
|
planet
|
small, non-luminous bodies that shine by reflected light
|
|
|
star
|
a self-luminous ball of hot gas that generates its own energy
|
|
|
astronomical unit (AU)
|
the average diistance from Earth to the sun, a distance of 1.5 X 10^11
|
|
|
light-year (ly)
|
the distance that light travels in one year, roughly 10^13 km, or 63,000 AU
|
|
|
galaxy
|
a great cloud of stars, gas, and dust bound together by the combined gravity of all matter (range from 1500 - 300,000 ly in diameter, can contain over 100 billion stars)
|
|
|
Milky Way Galaxy
|
our galaxy, which appears to us as a great, cloudy wheel of stars ringing the sky
|
|
|
spiral arm
|
our galaxy, like many others, had graceful _ _ winding outward through the disk. Stars are born in a great cloud of gas and dust as they pass through the _ _.
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