Carbon monoxide observations and chemical models favor a more oxygen-rich Neptune, offering clues to the ice giants’ different histories.

Uranus and Neptune may resemble twins today, but their chemistry is telling us that they are more like cousins with very ...

Artist’s concept of TOI-1231 b shows a mini-Neptune-sized world that has a deep atmosphere ideal for further study by space telescopes. Image via NASA/ JPL-Caltech/ UNM. … offers exciting research ...

This artist's illustration shows two Earth-sized planets, TRAPPIST-1b and TRAPPIST-1c, passing in front of their parent red dwarf star, which is much smaller and cooler than our sun. NASA/ESA/STScI/J.

Planets between the Earth and Neptune in size don’t exist in our solar system, but they seem to be common elsewhere. They are a cross between our solar system’s rocky terrestrial planets and its ice ...

At the left, an enhanced-color image of Neptune from the NASA/ESA Hubble Space Telescope. At the right, that image is combined with data from the NASA/ESA/CSA James Webb Space Telescope. The cyan ...

As planet-hunting scientists find more and more planets, they've encountered some puzzles. One of them concerns the lack of Neptune-size worlds orbiting close to their stars. Astronomers think that ...

A team led by an astronomer from the University of Kansas has crunched data from NASA’s TESS and Spitzer space telescopes to portray for the first time the atmosphere of a highly unusual kind of ...

Artist’s rendering of TOI-1231 b, a Neptune-like planet about 90 light years away from Earth. NASA/JPL-Caltech Discovering planets beyond our solar system is one thing — we’ve discovered over 4,000 ...

In the wild unknown, out beyond the orbit of Neptune, astronomers have found a tiny world that defies our understanding of skies. This baffling object measures around 500 kilometers (310 miles) across ...

Long-duration observations of Neptune’s brightness at two visible wavelengths provide a disk-averaged estimate of its atmospheric aerosol. Brightness variations were previously associated with the ...