Early astronomers would look into
the Universe with their telescopes and notice "milky" areas
that they could not be defined as one star. Sir William Herschel, in
the late 1700's, counted stars and recorded them, developed a notion
of the Galaxy. The Galaxy referred to our own Milky Way with
its billions of stars, with our Sun and planets being a component.
Other galaxies were found
throughout the Universe. These islands of stars had different shapes
and sizes. The Andromeda Galaxy is spiral, and is larger than
our Milky Way Galaxy. Most galaxies are named for their shape and
given numbers to identify them. For instance, elliptical galaxies
are classified with a "E." The picture below shows
different shapes that galaxies can take.