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Since, we can only see "the observable universe", how do we know how much mass is beyond our view? If we don't know what is there, why do we think there is miss
by swframe2 8y ago
Since, we can only see "the observable universe", how do we know how much mass is beyond our view? If we don't know what is there, why do we think there is missing mass?
- mort96 8y agoWhen we measure the amount of mass in a galaxy, we see that the galaxy's rotation is way faster than the amount of mass would indicate.