Sun

mass (about 2×1030 kilograms (2×1027 tons), 330,000 times that of Earth) accounts for about 99.86% of the totalmass of the Solar System.It is believe to be brighter then 85% of the other stars in the Milky Way Galaxy.

Formation
The sun formed about 4.6 billion years ago as a result of a collapse of a region within a large molecular cloud.Most of it gathered in the center,while the others formed the Solar System.It is believed most of the other stars were formed this way.