A new image of the planet-forming disk around the young star RU Lup reveals a beautiful and unexpected massive spiral of gas, reminiscent of a spiral galaxy.

We can't believe it. One of the most popular articles at EarthSky this week is the one asking, will Mars be as big as the moon on August 27? Short answer … no. This hoax has been circulating since 2003.

New research suggests that many of Mars' ancient channels, thought to have been carved by flowing surface water, were formed instead by meltwater beneath glacial ice sheets.

Galactic cosmic rays are high energy particles from explosive events like supernovae, zinging through our solar system, constantly bombarding both Earth and Mars. A researcher suggests they supply enough energy to make subsurface life on Mars possible.

The European Space Agency's Trace Gas Orbiter has unexpectedly detected carbon dioxide and ozone in Mars' atmosphere where the elusive methane should be, researchers in the UK and Russia have announced. The two gases may be hindering the probe's methane detections.

The SpaceX Crew Dragon splashdown into the Gulf of Mexico today was the first splashdown in 45 years.

A mysteriously long, thin cloud has again appeared over the Arsia Mons volcano on Mars.

These are the first spacecraft images yet acquired of the north pole of Ganymede, largest moon of the giant planet Jupiter. NASA's Juno spacecraft - now orbiting Jupiter - obtained them.

It was a picture-perfect launch this morning for the Mars 2020 Perseverance rover, with good weather and no major hitches. The rover lifted off on a United Launch Alliance Atlas V rocket from Cape Canaveral Air Force Station in Florida.

And why this rediscovery of a lost world - called NGTS-11b - bodes well for finding habitable exoplanets.