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Celestial Objects
The Universe
Galaxies
they contain
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stars,
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dust,
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gas, and
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other celestial bodies
They are bound together by gravitational forces
-
100,000 to 3,000,000,000,000 stars
There are three major types
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spiral (with arms)
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elliptical (no arm)
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irregular (without rotational symmetry)
The
Earth,
Sun
and the rest of our
solar system are a tiny part of the
Milky Way Galaxy, a spiral galaxy.
The Milky way Galaxy is just one galaxy in a group of galaxies called the
Local Group.
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Within the Local Group, the Milky Way Galaxy is moving
about 300 km/sec (towards the
constellation Virgo).
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The galaxy that is nearest to our galaxy may is the
Sagittarius Dwarf galaxy,
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It is about 24 kiloparsecs or 80,000 light years from us.
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The Large Magellanic Cloud is another close galaxy; it is
about 50 kiloparsecs from us.
Extremes
WEIGHT
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