human
What are some of the most interesting facts about astrophysics?
assistant
1. The universe is expanding at an ever-increasing rate, which means that it's getting bigger and bigger.
2. There are over 200 billion galaxies in our observable universe, each containing hundreds of billions of stars.
3. Our solar system is located within a spiral galaxy called Milky Way.
4. The sun is a star that contains 99% of all the mass in our solar system.
5. Astronomers have discovered more than 1,000 planets outside our solar system.
6. Most stars are similar to our sun, but there are also red giants, white dwarfs, neutron stars, black holes, and other exotic types of stars.
7. The Big Bang theory states that the universe began as a hot, dense, and rapidly expanding state.
8. Cosmic rays are high energy particles that originate from supernovae explosions, pulsars, and other sources.