SUNSET: 
Scientists Measure Mars's Effect on Earth's Climate
Tiny Mars might have an outsize effect on Earth's climate over hundreds of thousands of years.
Martian Moon Deimos Might Have Reshaped Itself and Its Orbit
A new study suggests that an early version of Mars’s smaller moon Deimos was pulverized by its own debris, explaining the moon's oddities.
Tiny Sparks of Lightning Detected on Mars for the First Time
The microphone on NASA's Perseverance rover unexpectedly heard tiny claps of thunder from sparks caused by colliding dust grains.
Best Evidence Yet for Past Life on Mars?
The Perseverance has found compounds associated with life on Earth. But whether they indicate life on Mars awaits sample return.
Mars Might Have a Surprisingly Large, Solid Core, Marsquakes Reveal
Marsquakes reveal a lumpy, viscous mantle and a large, solid inner core, with profound implications for Mars past, present, and future.
Astronomy in Pictures: From Cosmic Lenses to Dust Devils on Mars
Some cosmic perspective is a perfect cure for the Monday blues!
Why Is Mars Red?
Martian dust is red because of rust — but the rust on Mars is not the same iron oxide mineral found on Earth.
Mars Extravaganza — Occultation and Opposition Rolled into One!
Mars is big and bright again! In a spectacular preview to its upcoming opposition, the full Moon occults the Red Planet on January 13th.
Icy Rivers May Have Flowed on Ancient Mars
A polar cap of carbon-dioxide ice may have provided the thermal blanket needed for rivers and a huge lake to form in the planet’s southern highlands.
Giant Ancient Volcano Discovered on Mars
Scientists have identified a colossal volcano on Mars using satellite imagery. It was undetected for decades due to extensive erosion.
Icy Impactor Might Explain the Formation of Mars’s Moons
In a new study, scientists suggest an impact with a giant icy object could explain the formation of Mars's moons, Phobos and Deimos.
NASA Ends Mars Ingenuity Helicopter Mission
NASA’s ground-breaking Ingenuity helicopter, part of the Perseverance mission, comes to a rest on the Red Planet.
Buried Polygons on Mars Point to “Stark Environmental Transition”
Polygons buried beneath the surface of Mars indicate an abrupt transition in the planet's early history.
Marsquake Reveals Molten Layer Above Martian Core
An impact far from NASA's Insight lander on Mars set off seismic waves that revealed new details about the Martian interior.
What Mud Cracks Mean for Life on Mars
Mud cracks are evidence for sustained wet-dry cycles on ancient Mars, which might have provided conditions amenable to life (with caveats).
Perseverance Finds Complex Organics (Not Life) on Mars
NASA's Perseverance has sniffed 10 rock samples and found signatures of organic molecules, a sign of a complex geochemical past.
The Moon Deimos Might Be a Piece of Mars
Surprising new results from the United Arab Emirates' Hope probe call the origin of Mars's smaller moon into question.
Listen to a Martian Dust Devil
The Perseverance rover on Mars has recorded a dust devil using its microphone, providing unprecedented data about these whirlwinds.
See Bright Mars Wink Out Behind the Moon
The night of December 7–8 will be an exciting one for fans of the Red Planet. Not only will Mars be at opposition, but the full Moon will blot it out of the sky for many locations on Earth.
NASA Lander and Orbiter See (and Feel) New Mars Impacts
NASA's Mars Insight lander and Mars Reconnaissance Orbiter have witnessed two fresh new planet-probing impacts.
