Mars’s Most Mysterious Cloud Might Be Defying Textbook Cloud Physics

It may not be as obvious, but just like Earth, Mars has seasons. And every day of every summer, an 1,800 kilometer long thin white cloud appears to the west of Arsia Mons, a 20 kilometer high extinct shield volcano. At least for a few hours, before it dissipates until it reappears the next morning. Scientists have known about this feature, which they call the Arsia Mons Elongated Cloud (AMEC), for decades, but planetary scientists have been unable to explain it using traditional atmospheric models. But a new paper, published in Nature Geoscience by a research team led by Dr. Jorge Hernández-Bernal of the Sorbonne, suggests that the cloud could be the first documented real-world example of a cloud flash-freezing out of thin air.

Scientists Use Ancient Rains to Map the Possible Origin Life on Mars

Billions of years ago, rain may have helped shape where the chemistry of life could begin on Mars. A new study maps how formaldehyde, an important prebiotic molecule, may have reached the surface. This map could help guide future missions searching for signs of past life on Mars.

JAXA's Martian Moons eXploration Mission is on its Way to Mars and Phobos

JAXA successfully launched its Martian Moon eXplorer on its way to Mars and Phobos. It'll reach Mars in about six months, and will orbit the planet for about a month before transferring to an orbit around Phobos. It will deploy a small lander, which will help select a sample-gathering location for the main part of the mission. By 2031, the regolith sample from Phobos should be back on Earth.

The Gas Near Sagittarius A-star is Enriched in Metals, Probably from Supernovae Explosions

The region near Sagittarius A-star, the Milky Way's supermassive black hole, is enriched in metals, although only modestly. The likely cause is supernovae explosions, which synthesize elements heavier than hydrogen and helium. Over time, this metal-rich gas found its way towards the SMBH. The increased metallicity and heat from the supernova affect how fast gas flows into the SMBH.

JWST Tracks Shifting Water Clouds and Churning Gases on the Coldest Known Brown Dwarf

When picturing a star, typically people think of giant balls of burning gas in the sky that emit enough light they are hard to miss. Planets, on the other hand, come in one of two general categories - rocky worlds like Earth or gas giants similar to Jupiter. But there is a third category of astronomical object that doesn’t really fit either of those descriptions, and also doesn’t exist in our own solar system. Known as a brown dwarf, they are sometimes called a “failed star” as they form the same way stars do, but never reach the critical mass of material to create active fusion in the cores. They are also much too massive to be considered a regular planet. But a new paper from researchers led by Brittany Miles of the University of Arizona describes one similarity between the coldest known brown dwarf and some of the planets in our solar system - it has water-ice clouds.

Webb Captures This Golden Galaxy Cluster in All it's Glory

The NASA/ESA/CSA James Webb Space Telescope Picture of the Month features the brilliant golden galaxies belonging to the MACS J0454.1-0300 galaxy cluster.

The ESA's Euclid Space Telescope Has Discovered A New Comet

The ESA's Euclid space telescope was launched in July, 2026, and its mission is to observe billions of galaxies. The goal is to measure their redshifts over 10 billion years of Universal expansion, to better understand dark matter and dark energy. Surprisingly, the telescope has discovered a brand new comet, now named C/2026 S1 (Euclid).