So does the milky way.Isnt that been proven already?

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And the Milky Way is on the menu in about 4 billion years.

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So does every celestial body. That's how gravity works.

And vice versa, from latest estimates they’re about the same size

Gravity is the real cannibal.

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Source on that? Last I heard Andromeda is about twice the size.

I found out an article there https://www.astronomy.com/news/magazine/2018/02/adromeda-is-the-same-size-as-the-milky-way

Interesting. Less dark matter isn't what I was referring to specifically though. Still seeing it listed as about 200,000 light-years in diameter, which is double the Milky Way.

The smoking gun was the discovery of the Sagittarius dwarf galaxy in the nineties, showing a direct, ongoing merger event between Sagittarius and the Milky Way. This article is a little sensational, but the paper they are describing just suggests that the authors find evidence for a more recent (few billion years ago) possible large-scale merger event for Andromeda. More evidence will be required to confirm if that interpretation is correct.

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I think you're right. According to a quick google search Andromeda has about a trillion stars compared to the estimated 300 billion the Milky Way has.

It has way more stars but it’s mass could be anywhere from 1.8x ish to actually less than the Milky Way (according to wiki). There’s some pretty big error bars on it.

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