mars

Previously unpublished photos of Mars' moon Phobos hint that the mysterious satellite may actually be a trapped comet — or perhaps just a piece of one, along with its twin moon Deimos.

Newfound rocks on Mars suggest the planet may have once sported an oxygen-rich atmosphere, making it more Earth-like and hospitable to life than previously thought.

Mars has had frequent planet-wide auroras in recent months, including an unprecedented trio of events in February. Experts say the sudden increase is the result of the ongoing solar maximum.

Every spring, creepy black 'spiders' sprout up on Mars as buried carbon dioxide ice releases dusty geysers of gas. New ESA images show the phenomenon has begun in the strange Inca City formation.

Researchers have found microbes thriving 13 feet beneath the scorched surface of Chile's Atacama Desert, marking the deepest discovery of microbial life in the region to date.

NASA's stranded Ingenuity Mars Helicopter has beamed back its final signal to Earth from the Red Planet, which included a farewell message for mission scientists. It will continue collecting data on Mars until it dies but will not transmit this data to Earth.

NASA's plan to retrieve as many as 30 geological samples from Mars is getting a major rewrite, agency officials said on Monday. The initial plan, which would not return the samples to Earth until 2040, was deemed "too expensive" and "unacceptably too long."

Dozens of boulders dislodged by NASA's asteroid-smashing DART test could hit Mars in the future, new research suggests.

An object that slammed into Mars roughly 2.3 million years ago created 2 billion smaller craters around the main Corinto impact crater, near the Red Planet's equator.

The solar system's eight planets will never truly be in a straight line, but they can get close to it.