Why do astronomers think the Milky Way and the solar system formed in pretty much the same way?
Question:
Answer:
They don't think they formed the same way. The solar system was formed from the nebula that formed the sun. It has long dissipated but is usually called the "solar nebula." Gas and dust formed a flat accretion disk around the sun, and it was from that disk that the rest of the solar system formed. Eventually the solar wind and light from the sun blew away the disk.
Our galaxy is at least 10 billion years old, while our solar system is around 4.5 billion years old. Nobody really knows how galaxies form, including our own, though I highly doubt it was formed the same way as our solar system.
The way you presented your question I can only say that since our Solar System is part of the Milky Way, it just makes sense that they we're formed the same way.
Milky Way = Galaxy
Solar System is inside the Milky Way Galaxy.
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