Astronomy Definitions- 1

Celestial Object
Any object that exists in space, such as planets, stars and the moon
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Revolution
the amount of time it takes for an object to orbit another object. Earths revolution around the sun is 365.24 days
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Rotation
the turning of an object on its imaginary axis running through it.
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Constellation
a group of stars that seem to form a distinctive pattern in the nights sky
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Light-Year
the distance that light travels in one year.
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Light-Year (numbers)
light travels at 300 000 km/s and one light year is 9.5 x 10^12km
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Apparent Magnitude
the brightness of a star as seen from earth. 1-6 (one being the brightest)
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Latitude
the location above or below the equator
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Phases of the Moon
the monthly progression of changes in the appearance of the Moon, which results from different portions of the the Moon's sunlit side being visible from Earth.
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Eclipse
the phenomenon in which on celestial object moves in front of another celestial object.
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Lunar Eclipse
the phenomenon in which the full moon passes the Earths shadow
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Solar Eclipse
the phenomenon in which the Moon's shadow falls on the Earth's surface
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Gravitational Force
the force of attraction between all masses in the universe
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Planet
an object the orbits around one or more stars (and is not a star itself) is spherical and does not share its orbit with another object
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Solar System
a group of planets that circle one or more stars
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Retrograde Motion
the movement of a object, usually a plant, from east to west rather than its normal motion from west to east
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Astronomical Unit
the average distance between the Earth and the Sun, about 150 x 10^6km
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Orbital Radius
the average distance between the Sun and the object orbiting the Sun
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Comet
an object composed from rocky material, ice and gas; comes from the Kuiper belt and Oort Cloud
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Asteroids
a small object, believed to be space debris, that ranges in size, from a tiny speck to 500km wide; most asteroids originate from the asteroid belt between Mars and Jupiter
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Meteoroid
a piece of rock moving through space
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Meteor
a meteoroid that has enters that Earths atmosphere a burned up
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Meteorite
a meteoroid that is large enough to enter the Earths atmosphere and reach the earths surface without burning up
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Other cards in this set

Card 2

Front

Revolution

Back

the amount of time it takes for an object to orbit another object. Earths revolution around the sun is 365.24 days

Card 3

Front

Rotation

Back

Preview of the front of card 3

Card 4

Front

Constellation

Back

Preview of the front of card 4

Card 5

Front

Light-Year

Back

Preview of the front of card 5
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