Relatedly, astronomers may have just pushed the upper size limit of what counts as a planet.

Light is the fastest phenomenon in the universe, clocking in at just under 300,000 kilometers per second. The telescopes that observe that light, from radio waves to gamma rays, are built at rather ...

Astronomers used James Webb Space Telescope data to determine the density of the universe's most mysterious "stuff." ...

Gas giants are large planets mostly composed of helium and/or hydrogen. Although these planets have dense cores, they don't ...

Hubble observations reveal a giant, turbulent planet-forming disk that may reshape theories of how planetary systems develop.

David leads the editorial team at CNET. We create expert reviews, articles and video on every aspect of technology, from AI to Zoox. We are thoroughly, proudly human. Expertise A 25-year CNET veteran, ...

GS-z14-0, the most distant galaxy ever observed. Seen just 300 million years after the Big Bang, its brightness and chemical ...