Michael Wall is a Senior Space Writer with Space.com and joined the team in 2010. He primarily covers exoplanets, spaceflight and military space, but has been known to dabble in the space art beat. His book about the search for alien life, 'Out There,' was published on Nov. 13, 2018. Before becoming a science writer, Michael worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Michael on Twitter.
"The problem is, there's no reason whatsoever to believe general relativity in that regime," said Sean Carroll, a theoretical physicist at Caltech."It's going to be wrong, because it doesn't take into account quantum mechanics. And quantum mechanics is certainly going to be important once you get to that place in the history of the universe."
, the theory goes. Dark energy is the mysterious force that scientists think is driving the universe's current accelerating expansion. Most cosmologists regard inflation as the leading theory for explaining the universe's characteristics — specifically, why it's relatively flat and homogeneous, with roughly the same amount of stuff spread out equally in all directions.
This idea holds that our universe didn't emerge from a single point, or anything like it. Rather, it bounced into expansion — at a much more sedate pace than the inflation theory predicts — from a pre-existing universe that had been contracting. If this theory is correct, our universe has likely undergone an endless succession of bangs and crunches.
This all-sky image of the cosmic microwave background, created by the European Space Agency's Planck satellite, shows echoes of the Big Bang left over from the dawn of the universe.But first, how did our universe spring up out of nothing? Cosmologists suspect that
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