The Cosmic Background Explorer satellite (COBE) went up on a Delta rocket on Nov. 18, 1989, into a polar sun-synchronous ...

Spanish astronomers have conducted a near-infrared study of an ultra-high energy gamma-ray source designated LHAASO ...

Understanding how massive stars evolve and return energy, momentum, and metals to their surroundings is a central problem in ...

The big bang wasn’t the start of everything, but it has been impossible to see what came before. Now a new kind of cosmology is lifting the veil on the beginning of time ...

The cosmic microwave background (CMB) is radiation that fills the universe almost uniformly—basically the leftover glow from the early cosmos. It has an almost perfect blackbody spectrum at about 2.7 ...

For the first time, scientists have watched high‑energy cosmic rays at work deep inside a thick cloud of gas, not just at its outer surface. Using the High Altitude Water Cherenkov Observatory (HAWC), ...

A portable detector the size of a cookie box reveals in real time the cosmic particles that pass through your body every ...

So cosmologists feel confident in modelling the universe using the “maximally symmetric” description of space-time in Einstein’s theory of general relativity. This symmetric vision for the universe, ...

Two ways of measuring how fast the universe is expanding disagree, a puzzle known as the Hubble tension. Tiny magnetic fields ...

Physicists suggest that a single, extraordinarily powerful cosmic signal detected on Earth could be linked to the explosive end of a tiny black hole from the early universe. That signal now stands as ...

Where starlight doesn't reach, new things are born: For the first time, an international research team has directly measured the effect of cosmic radiation in a cold molecular cloud. The observation ...