Taking full advantage of a rare solar "backlight," NASA's Cassini spacecraft has discovered a faint new ring around Saturn, as well as other interesting ring features.
The hunt for extraterrestrial life has a new tool: a system of "fingerprints" scientists will use to compare alien worlds with Earth as it has appeared over the eons.
Astronomers say they have discovered the largest planet ever found, a supersize gas giant about 1.4 times the size of Jupiter that's unlike any other known world.
A concept abandoned in the 19th century is being revived by a physicist as an alternative to dark matter, despite recent announcements of proof of the theoretical substance.
Gas giants that orbit close to their stars likely migrated inward, shaking up debris that could coalesce into Earthlike worlds, new computer models predict.
Our radio shows have already reached dozens of planets in nearby star systems. If there are intelligent beings on these worlds, what are they listening to, and why haven't they replied in kind?
"My! Very educated morons just screwed up numerous planetariums." That mnemonic device is just one way teachers and others are adapting to Pluto's loss of planet status.
This week: Pluto not a planet, "Atlantis" eruption update, jellyfish invasion, ant speed record, interview with Kilimanjaro's quickest conqueror, more.
A team of researchers has found the first direct proof for the existence of dark matter, the mysterious and almost invisible substance thought to make up almost a quarter of the universe.
Astronomers unveil a plan to define planets according to physical properties—and the proposal could add as many as 50 more planets to the solar system.
