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 cool. How many galaxies are there in the universe?
user
There are billions of galaxies in the universe. Scientists estimate that there are around 100 to 400 billion galaxies in the observable universe.
assistant
Wow, that's a lot. Can you tell me more about the Milky Way?
user
The Milky Way is a barred spiral galaxy that contains hundreds of billions of stars, including our sun. It's about 100,000 light-years in diameter and is thought to have formed around 13.6 billion years ago.
assistant