Galaxies are so cool! I just want to learn more about them!
Who are you?
I'm here to make your wish come true!
It all started with the big bang which probably took place about 13 billion to 14 billion years ago.
Galaxies are collections of stars, gas, dust, and dark matter held together by gravity. Their appearance and composition are shaped over billions of years by interactions with groups of stars and other galaxies.
The Milky Way Galaxy where we live in contains 200 billion stars, and enough dust and gas to make billions more.
Well, NASA's Hubble Telescope shows that Milky Way is destined for head-on collision with Andromeda!