Galaxies

Galaxies are enormous, and composed of thosands of solar systems. Our galaxie is called the milky way, and we are actually very far off from the center. We are at the edge on a spot called orion spiral arm. There is about 100 billion other stars in our galaxie. The Sun is revolving around the center of the Galaxy at a speed of half a million miles per hour, yet it will still takes 200 million years to go around once. (thats big). The milky way is roughly 10 billion years old. Our galaxie is about 100 000 light years in diameter. Our planet is 26,000 light years away from the center.

Galaxies look like huge spirals. Scientists theorize that there are black holes at the center of galaxies, ours is called Sagittarius A*, and these black holes are actually extremly massive. Galaxies are composed of mainly three parts, The halo a spherical distribution which contains the oldest stars in the galaxy, the nuclear bulge and galactic center which is usually brighter than the other parts, and the disk, which contains the majority of the stars, including the sun, and virtually all of the gas and dust. About two million galaxies have been actually couted in the universe but there could be 100,000 million. There are many galaxies out there, with maybe other life forms but to try and even comprehend how huge our galaxie actually is, its incredible to think that there are so many other ones out there.