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15 Cards in this Set

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Galaxy
a large system of stars held together by mutual gravitation and isolated from similar systems by fast regions of space
milky way
the spirel galaxy containing our solar system
spirel galaxy
a galaxy having a spirel structure; arms containing younger stars spirel out from old stars at the center
elliptical galaxy
a type of galaxy having the shape of a spheroid or ellipsoid rather than a disk
iregular galaxy
a galaxy that does nto have a clearly defined shape or structure
local group
a group of 17 galaxies that includes our own, the milky way galaxy
binary stars
a stellar system consisting of two stars orbiting about a sommen center of mass and often appearing as a single visual or telescopic object
cluster stars
groups of stars witch are gravitationally bound. there are two kinds-spherical(round) and open (loosely arranged)
big bang
a theory of the birth of the universe from a single cosmic explosion. it holds that the universe is still expanding
revolution
the orbit of the earth around teh sun witch determines teh length of a year (365 1/4)
rotation
the spinning of teh earth on its axis witch determines the length of a day(24 hours)
astroid
a rocky and metallic object that orbits the sun but is to small to be considered a planet. known as a minor planet
comet
a relativley small extraterrestial body consisting of a frozen mass(water and gases) that travels around the sun in a highly Elliptical orbit
solar eclipse
this occurs when the moon passes in front of the sun and either partially or totally blocks it from our view
luner eclipse
this occurs when the earth passes between the sun and the moon , the moon passes through the earth's shadow