Hey!
user
Hello! How can I help you today?
assistant
I'm interested in learning about galaxies. What is a galaxy?
user
A galaxy is a massive collection of stars, gas, and dust that are held together by gravity. Our solar system is part of the Milky Way galaxy.
assistant
That's interesting. How many galaxies are there in the universe?
user
Scientists estimate that there are over 100 billion galaxies in the observable universe. However, new discoveries are constantly being made, so this number may not be exact.
assistant
Wow, that's a lot. Can you tell me more about the Milky Way galaxy?
user
The Milky Way is a spiral galaxy, consisting of hundreds of billions of stars, including our sun. It's estimated to be about 100,000 light-years in diameter.
assistant