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18 Cards in this Set

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  • Back
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 _ _.
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 _ _.