"For some reason, even though I’d spent family holidays staring up at the light pollution free skies full of stars, doing that as part of a degree and possibly a career had never even occurred to me. As far as I was concerned, it just wasn’t something that people like me did."
Our galaxy is held together by gravity, and when it merges with Andromeda the resulting galaxy – Milkomeda – will be held together too. In fact, there are more than 50 galaxies that make up something called the Local Group, and eventually they'll all be part of Milkomeda too.
But because everything else is rushing away from us, at some point, a very long time in the future, we won't be able to see any galaxies other than our own.
When asked what he says to male academics who don’t hold as progressive a view point as him, Greengard’s answer was short: “I don’t speak to them.”