A galaxy is a massive, gravitationally bound system, consists an important but poorly understood component tentatively dubbed dark matter. Typical galaxies range from dwarfs with as few as ten million (107) stars up to giants with hundred trillion (1014) stars, all orbiting the galaxy's center of mass. The Sun is one of the stars in the Milky Way galaxy; the Solar System includes the Earth and all the other objects that orbit the Sun.
No comments:
Post a Comment