our galaxy was a quasar when we were young.
our galaxy has a super-massive black hole at its heart.
our solar system may have had hundreds of planets smashing into each other in the beginning.
after a planet smashed into the Earth and ruptured the mantel, debris circled the Earth until it clumped together and formed our moon.
without our moon, life would not be able to exist on Earth.
Jupiter protects us from asteroids.
Asteroids are leftover smashed-up planet pieces.
From “How the Universe Works” on Science Channel