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As informed Science alert the latest data indicates that the Universe is expanding much faster than it should be based on the conditions just after the Big Bang. The revised expansion rate is about 10% faster than that predicted by observations. The so called Hubble Constant is responsible for Universe’s rate of expansion.
According to data from the Planck satellite that measured the cosmic microwave background (the conditions of the early Universe just 380,000 years after the Big Bang), the Hubble Constant should be 67.4 kilometres (41.9 miles) per second per megaparsec, with less than 1 percent uncertainty.
“This mismatch has been growing and has now reached a point that is really impossible to dismiss as a fluke,” study lead author Adam Riess, a professor of physics and astronomy at The Johns Hopkins University in Baltimore, said in a statement.
“This is not what we expected,” said Riess, who won the Nobel Prize for physics in 2011 (along with Brian Schmidt and Saul Perlmutter) for showing, in the late 1990s, that the universe’s expansion is accelerating. It’s unclear what’s driving this surprising acceleration, but many astronomers invoke a mysterious, repulsive force called dark energy.
During the new study Riess and his colleagues used the Hubble Space Telescope to research 70 Cepheid variable stars in the Large Magellanic Cloud (LMC), one of the Milky Way’s satellite galaxies.
“The Hubble tension between the early and late Universe may be the most exciting development in cosmology in decades,” said astrophysicist Adam Riess of the Space Telescope Science Institute (STScI) and Johns Hopkins University.
The expansion rate that scientists expected, by contrast, is about 41.9 miles (67.4 km) per second per megaparsec.
“This is not just two experiments disagreeing. We are measuring something fundamentally different,” Riess said.
Source: Text; www.space.com, www.sciencealert.com
Image credit; www.space.com
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