Timeline for Is the universe flat?

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Apr 2, 2014 at 6:59	comment	added	kleingordon		First, every time I speak of the "universe," I implicitly mean the observable universe, which we see all the way out to 13 billion light years via the CMB. Second, you are correct that we don't understand dark energy in detail. Many of these details will affect the exact rate at which the universe will expand in the future, which remains uncertain. But the fact that the expansion is accelerating has been measured quite robustly, even when accounting for probable sources of error. This accelerated expansion calls for some new piece of physics beyond matter and radiation energy.
Apr 2, 2014 at 6:35	comment	added	rowanman28		OK, but even with the presence of dark energy, it would depend on whether it remained at constant density, despite the expansion, which causes a lower density of every other type of energy, and whether dark energy has a point when it stops pushing, and starts pulling with it's own gravity. I find it hard to believe they know anything about it, based on observations, as the vast majority of the universe can't be seen, and what we can see, we interpret with a fairly large margin of error like intergalactic distance measurements. The simplest solution is usually true.
Apr 2, 2014 at 5:40	history	edited	kleingordon	CC BY-SA 3.0	added 51 characters in body
Apr 2, 2014 at 5:32	history	edited	kleingordon	CC BY-SA 3.0	added 448 characters in body
Apr 2, 2014 at 5:23	history	answered	kleingordon	CC BY-SA 3.0