The Milky Way Galaxy is a spiral galaxy
that contains about one hundred to two hundred billion
stars. It has dust clouds called nebulae. They block out
light from some stars. You cannot see most nebulae.
Scientists think that the Milky Way estimates to be one
hundred thousand light years in diameter and fifteen
thousand light years thick. Even if traveling at light
speed, it would take one hundred thousand years to travel
across. The Milky Way rotates around its center.
The Milky Way turns counterclockwise. It takes the solar
system two hundred billion years to move around the center
of the Milky Way Galaxy. Scientists theorize that since the
Earth moves around the sun and that the solar system moves
around the Milky Way Galaxy that the Milky Way Galaxy Must
rotate around the center of the universe. Nobody knows if
this is true because satellites can't reach that far and
humans can't travel in space for very long. There are two types of star clusters in
our galaxy. There are open clusters and there are globular
clusters. Globular clusters are a round shape. They can
contain more than one hundred thousand stars. Open clusters
aren't as neat as globular clusters. They contain hundreds
of stars.