How much has the universe expanded?
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The most precise measurement ever made of the speed of the universe's expansion is in, thanks to NASA's Spitzer Space Telescope, and it's a doozy. Space itself is pulling apart at the seams, expanding at a rate of 74.3 plus or minus 2.1 kilometers (46.2 plus or minus 1.3 miles) per second per megaparsec (a megaparsec is roughly 3 million light-years).
If those numbers are a little too much to contemplate, rest assured that's really, really fast. And it's getting faster all the time.
If those numbers are a little too much to contemplate, rest assured that's really, really fast. And it's getting faster all the time.
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