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Cougar
2012-Sep-18, 12:52 AM
The Universe is expanding and the expansion is accelerating. Do we consider the expansion and the acceleration as two different things because of an accident in the sequence of discovery? Are they known to be the result of two different "mechanisms," or could they be defined by a single quality of the "vacuum" of space?

antoniseb
2012-Sep-18, 01:34 PM
The Universe is expanding and the expansion is accelerating. Do we consider the expansion and the acceleration as two different things because of an accident in the sequence of discovery? Are they known to be the result of two different "mechanisms," or could they be defined by a single quality of the "vacuum" of space?
They could be a single cause, or the superposition of several causes. We are studying the dynamics of it all as best we can measure it to get a better sense of which models are ruled out, and which are still possible.