Dark comets are comets that are so small, fast and/or chemically rare that they are difficult to see from Earth

The cosmos began expanding with the Big Bang but then around 10 billion years later it strangely began to accelerate thanks to a theoretical phenomenon termed dark energy. Credit: NASA One of science’s biggest mysteries is dark energy.

NASA astronauts Sunita "Suni" Williams and Barry "Butch" Willmore were expected to return home in February after their extended stay at the ISS, but NASA confirmed the two will be in space longer.

Dark matter's mass limit increased by an order of magnitude, impacting our understanding of the universe's invisible substance.

The Nancy Grace Roman Space Telescope team at NASA has completed the integration of the telescope and its instruments onto the carrier, a significant milestone in the assembly process. With the Coronagraph Instrument and the Optical Telescope Assembly in place,

In case dark matter didn't seem mysterious enough, a new study proposes that it could have arisen before the Big Bang.

Find out about the recent developments regarding the Roman Space Telescope and how they might bring us closer to understanding the universe.

Some of this stuff is known as mysterious dark matter, others are things like dark comets, which as their name suggests, are far more difficult to see from Earth than something like Tsuchinshan-Atlas.

When it comes to particle physics, however, much of the action takes place in giant accelerators smashing particles together at the speed of light. These accelerators are sometimes humanmade and therefore live on Earth — other times, they're of the cosmic sort and exist in deep space.

What knocked this black hole over onto its side? It's a cosmic "whodunnit" that NASA scientists using the Hubble and Chandra space telescopes are trying to solve. When you purchase through links on our site, we may earn an affiliate commission. Here’s ...

Scientists with NASA are launching enormous balloons, the size of a football stadium, from the Antarctic ice. They're carrying experiments on dark matter and other mysteries.