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A comment on New class of galaxy has been discovered, made almost entirely of dark matter. Parent comment

Re:New class of galaxy has been discovered, made almost enti... by mikeash on Friday August 26, 2016 @02:33PM (#12368270)
In relativity, gravity isn't a force that causes acceleration, it's a change in the shape of space which changes the path objects take. Thus, gravity affects the path light takes, but that's still a "straight line," because what gravity is really affecting is what a straight line is.
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Re:New class of galaxy has been discovered, made almost enti... by effingwewt on Friday August 26, 2016 @07:17PM (#12369992)
This is my favorite explanation of this, mind if I forward this to an old Astronomy Professor? I think he'd love this too.
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Re:New class of galaxy has been discovered, made almost enti... by mikeash on Friday August 26, 2016 @09:13PM (#12370382)
Sure! Just beware that I'm far from an expert and may well have gotten something hilariously wrong. If he rips it to shreds, please let me know what he had to say.
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