No one knows exactly what’s pushing galaxies apart, but that hasn’t stopped physicists from naming this mysterious force. They call it “dark energy.” - NBCNewsMACH
A view of the distant universe produced by the Hubble Space Telescope, combining observations of the field from 2002 to 2012.Oct. 3, 2019, 7:01 PM UTCWe’ve known for decades that the universe is expanding. The idea lies at the heart of theBut in 1998, scientists made an astounding discovery: The universe isn’t simply expanding but is
. No one knows exactly what’s pushing galaxies apart, but that hasn’t stopped physicists from naming this mysterious force.We can’t see dark energy. We can’t feel it or detect it in any way even with sophisticated scientific instruments. But most astronomers are convinced it exists because we can see its effects in the movement of galaxies.
The Big Bang created all of the matter in the universe — from which galaxies eventually formed — and sent it spreading through space at great speed. In the absence of any additional force propelling galaxies apart, their mutual gravitational attraction would cause them to gradually slow down and perhaps reverse course — think of how a baseball thrown straight up into the air slows down and then falls back to Earth.
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