Transcript Stars and Galaxies

Stars and Galaxies
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Our sun is a star.
There are
countless more like
it in space.
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The sun is one of
billions of stars that
make up the Milky
Way.
The Milky Way is a
Galaxy.
A galaxy is a cluster of
stars held together
by the force of
gravity.
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The stars in a galaxy
are very far apart.
It may take several
years for a spacecraft
to reach other planets
in our solar system.
It may take several
centuries to reach
other stars in our
galaxy.
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Beyond the milky
way there are
other galaxies.
Scientists believe
there may be as
many as 100 000
million other
galaxies beyond
ours.
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Because gravity
attracts them
together, the stars
in a galaxy are
clustered.
This means there
are vast expanses
of nothing between
different galaxies.
Stars and Galaxies
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Our sun is a star. There are countless more like it
in space.
The sun is one of billions of stars that make up the
Milky Way. The Milky Way is a Galaxy.
A galaxy is a cluster of stars held together by
the force of gravity.
The stars in a galaxy are very far apart.
Scientists believe there may be as many as
100 000 million other galaxies beyond ours.
Because gravity attracts them together, the stars
in a galaxy are clustered.
There are vast expanses of nothing between
different galaxies.