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2007-08-27
Billion light-year void in the universe It appears to be 6-10 billion light-years distant and is described is this paper, which has reportedly been accepted for publication in the Astrophysical Journal. If I've made the right assumptions and done the calculations right, this void is about twice as big as the biggest known void. From today's Astronomy Picture of the Day: The void is not a hole in space like a black hole, but rather a vast region of the universe that appears to be mostly devoid of normal matter and even dark matter. The void is still thought to contain dark energy, though, and is clearly traversable by light. The void's existence is being postulated following scientific curiosity about how unusually cold spots came to appear on WMAP's map of cosmic microwave background (CMB) radiation. One possibility was that this CMB region was not actually very cold but light from the spot somehow became less cosmologically redshifted than normal along the way. Other voids in the universe are known to exist, but this void appears to have an unusually large gravitational effect, and so might possibly be the largest in our entire visible universe.
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