Greatest Astronomy Discoveries From Planets Moving to the
Accelerating Universe  Greatest Astronomy Discoveries From
Planets Moving to the Accelerating Universe  An extrasolar
planet is a natural planet that exists outside of our solar
system. Data from the Kepler mission suggests there are at least
50 billion planets in our own galaxy.  There also exist planets
that orbit brown dwarfs and free floating planets that orbit the
galaxy directly just as the stars do. It is unclear if either
type should be called a "planet".   Bruno was burnt at the stake
by the Holy Inquisition.   An extrasolar planet, or exoplanet,
is a planet outside the Solar System. As of August 10, 2011, 573
extra-solar planets have been identified.    Extrasolar planets
are one of the most greatest discoveries within astronomy.  The
following are some of the greatest discoveries within astronomy:
1. The Planets Move (2000 B.C. –– 500 B.C.) A thousand years of
observations reveal that there are stars that move in the sky
and follow patterns