The majority of stars in our galaxy are home to planets. The most abundant are the sub-Neptunes, planets between the size of Earth and Neptune. Calculating their density poses a problem for ...

A higher surface density of the solar nebula means that Uranus and Neptune formed closer and faster, in only 10 million years instead of billions,” says Desch.

Astronomers have observed a mysterious large dark spot in Neptune’s atmosphere, along with a bright feature that has never been spotted before.

A Neptune-sized planet denser than steel has been discovered by an international team of astronomers, who believe its composition could be the result of a giant planetary clash.

Researchers have shared a radical new idea for how to put a spacecraft in orbit around Neptune: Use the thin atmosphere of Triton, Neptune's largest moon, to capture it.

An international team of astronomers reports the discovery of a new super-Neptune exoplanet orbiting a solar-type star. The newly detected alien world, which received the designation TOI-5005 b ...