astronomy/galaxies
<|im_start|>user
Hey!<|im_end|>
<|im_start|>assistant
Hello! How can I help you today?<|im_end|>
<|im_start|>user
I'm interested in learning about galaxies. What is a galaxy?<|im_end|>
<|im_start|>assistant
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.<|im_end|>
<|im_start|>user
That's interesting. How many galaxies are there in the universe?<|im_end|>
<|im_start|>assistant
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.<|im_end|>
<|im_start|>user
Wow, that's a lot. Can you tell me more about the Milky Way galaxy?<|im_end|>
<|im_start|>assistant
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.<|im_end|>
<|im_start|>assistant
