Universe
the Universe
the totality of all the things that exist; creation; the cosmos
(Marvel Universe, the DC Universe, etc.)
Galaxy Clusters
a group of galaxies separated from other such groups by enormous regions of empty space
The Milky Way galaxy is a member of a cluster known as the local group, which contains 21 galaxies in a region 3 million light-years in diameter
Galaxies
a large system of stars held together by mutual gravitation and isolated from similar systems by vast regions of space
(Galactus)
Solar Systems
that portion of our galaxy which is subject to the gravity of the sun
Stars
a luminous celestial object seen as points of light in the sky
(the Sun, Northstar, Polaris)
Planets
a large, opaque, nonluminous mass, usually with its own moons, that revolves about a star
(Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Mars)
Moons
any natural satellite of a planet
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Some information gathered from "The Universe," (c) Zane Publishing, Inc. 1996
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