Quote:
Originally Posted by HarryT
Not a particularly long time in the lifetime of a galaxy. Our own Sun, for example, at about 5 billion years old, is only about half way through its lifetime as a main sequence star.
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7 billion years is half the (believed) lifetime of the universe. I'd say that's pretty long. Who knows how many of those galaxies have drifted away, or collided, &c.?