Cosmic Time

Findings from the Dark Energy Spectroscopic Instrument (DESI) suggest that dark energy could be evolving over time. If they're right, cosmology will need a new model.

It set a new cosmic record.

"This process is like a cosmic CT scan, where we can look through different slices of cosmic history and track how matter clumped together at different epochs."

The universe's light-starved early epochs, as well as the first stars and galaxies, lie beyond the reach of conventional observatories but could be revealed by a new generation of radio telescope arrays

Astronomers say Porphyrion released energy equal to trillions of suns.

Structure of galaxy rules out early, bright objects were supermassive black holes.

Black holes are one of the most mysterious cosmological phenomena out there. Astrophysicist Priya Natarajan calls them "the point where all known laws of physics break down."On the list of perplexing qualities: The origins of supermassive black holes. That story was only confirmed within the last year. Check out more of our series Space Camp on the weird and mysterious in space at npr.org/spacecamp.Interested in…

Astronomers using the James Webb Space Telescope have observed the most distant known galaxy, which they claim is very luminous and nearly 300 million years old.

MIT astronomers observed the elusive starlight surrounding some of the earliest quasars in the universe. The findings may shed light on how the earliest supermassive black holes became so massive despite having a relatively short amount of cosmic time in which to grow.

For some reason, when we talk about the age of stars, galaxies, and the Universe, we use "years" to measure time. Can we do better?

Astronomers using the Webb telescope (JWST) have found a very early massive galaxy being formed through galactic mergers.

For nearly all of the 20th century, the biggest question over the expanding Universe had to do with understanding what its fate would be. The Universe, if it's expanding, had to be a race between two…

JWST has puzzled astronomers by revealing large, bright, massive early galaxies. But the littlest ones pack the greatest cosmic punch.

New findings from the James Webb Space Telescope reveal a surprising abundance of oxygen in the early Universe. Researchers discovered that oxygen levels in galaxies surged within 500-700 million years following the Universe's birth, reaching levels comparable to those in contemporary galaxies. This

Researchers analyzing images from NASA's James Webb Space Telescope have found that galaxies in the early universe are often flat and elongated, like

Astronomers have completed the largest and most detailed study of what triggers stars to form in the universe's biggest galaxies, using NASA's Chandra X-ray Observatory and other telescopes. They were surprised to find that the conditions for stellar conception in these exceptionally massive galaxies have not changed over the last ten billion years.

Observations of quasars reveal that many supermassive black holes were in place less than 700 million years after the Big Bang.

Euclid -- built and operated by ESA, with contributions from NASA -- has captured full-color images of a large cluster of galaxies, close-ups of two nearby galaxies, a globular cluster, and a nebula.

The earliest active supermassive black hole ever seen offers clues on how these enigmatic objects first formed

Research led by the University of Hertfordshire has revealed the dramatic history of Andromeda, our nearest neighboring galaxy. Using state-of-the-art modeling, Professor Chiaki Kobayashi and a team of international astrophysicists have determined details about the galaxy's history through galactic archaeology—an approach that examines the chemical composition of stars and the development of their host galaxy, to…