Space. It's really, really big. How big is it? Well, according to astronomers, the observable universe is around 92 billion light-years in diameter, but that's all we can see (hence the word ...

Astronomers have long estimated that ordinary matter – basically, anything other than dark matter – makes up only a fraction of the known universe. The conclusion stemmed from a complex calculation ...

"Precision in these measurements is critical, as even subtle discrepancies could signal deviations from the model — ...

The surface of Earth is finite. We can measure it. If it was expanding, then its size would grow with time. And once again, ...

Will the universe keep existing forever? An astrophysicist explains how scientists aren’t entirely sure, but they can make ...

IT IS ONE of the biggest mysteries in cosmology—and getting bigger all the time. Ever since Edwin Hubble, an American astronomer, published observations of distant galaxies in 1929, scientists have ...

The oldest and most distant black hole known to scientists dates back 13.3 billion years ago, when our universe was still in its teething stage, according to findings published this month. The ...

There is an important and unresolved tension in cosmology regarding the rate at which the universe is expanding, and ...

A team of astronomers says it has identified the most distant black hole ever confirmed — a cosmic heavyweight that formed just 500 million years after the Big Bang, when the universe was only about 3 ...

Ordinary matter – basically, anything other than dark matter – makes up about 15% of all matter. But half of it has long been missing. Powerful bursts of radio waves emanating from 69 locations in the ...