Time moved in slow motion
Time moved in slow motion during the early days of the universe
Scientists have peered into the early days of the universe, when it was about 1 billion years old, and discovered that things moved in slow motion compared with now.
The finding supports Albert Einstein’s general theory of relativity, which suggests that the distant universe moved much more slowly in the past.
Given the vastness of the universe, studying its earliest days is like looking back in time. Faint light from the oldest galaxies is still traveling across the universe to reach Earth, so the farthest reaches of the universe visible to scientists is light from the past.
But looking back into the ancient universe, formed by the big bang about 13.8 billion years ago, is an incredibly difficult task. The reach of sophisticated telescopes, which observe in different wavelengths of light, can only extend so far across the cosmos.
So, scientists turned to a phenomenon that can serve as a kind of celestial timetable: a quasar.
A quasar, or hyperactive supermassive black hole at the center of an early galaxy, is so luminous that it outshines our Milky Way galaxy by 100 times. This brightness acts as a cosmic clock that researchers can use to track time across the universe.
Observing quasars over time allowed a team of astronomers to see how the universe seemed to speed up as it aged. The results of the study published Monday in the journal Nature Astronomy.
“Looking back to a time when the universe was just over a billion years old, we see time appearing to flow five times slower,” said lead study author Geraint Lewis, professor of astrophysics at the University of Sydney’s School of Physics and Sydney Institute for Astronomy, in a statement.
“If you were there, in this infant universe, one second would seem like one second — but from our position, more than 12 billion years into the future, that early time appears to drag.”
Time moved in slow motion during the early days of the universe Scientists have peered into the early days of the universe, when it was about 1 billion years old, and discovered that things moved in slow motion compared with now. The finding supports Albert Einstein’s general theory of relativity, which suggests that the distant universe…