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Planetary Science & Exoplanets
Worlds near and far—atmospheres, habitability, and planetary formation.
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A molecular-hydrogen cloud only 300 light-years away spans roughly 40 full-Moon widths across our sky, yet astronomers did not identify it until 2025. Named Eos, it escaped conventional surveys because they search for molecular hydrogen indirectly through carbon monoxide—and almost all of Eos is CO-dark.
4+ hour, 35+ min ago (858+ words) Eos covers about 20 degrees of sky, but almost all its estimated 3,400 solar masses of molecular hydrogen escaped the carbon-monoxide surveys normally used to find such clouds....
Astronomers Spotted a 'Bear' on Mars
5+ hour, 5+ min ago (186+ words) On 12 December 2022, an orbiter traveling 251 kilometers (156 miles) above the southern highlands of Mars photographed a hill....
A Cosmic Catastrophe May Have Turned Neptune’s Ancient Moons Inside Out
9+ hour, 23+ min ago (962+ words) In 1989, Voyager 2 discovered six previously unknown moons around Neptune. Five of them are tiny satellites that travel just beyond the planet’s main rings. Their small size and great distance from Earth have made them especially difficult to study in detail....
Is This the First Exomoon
2+ day, 12+ hour ago (1676+ words) For decades, astronomers have been looking for moons beyond our Solar System. Several exomoon candidates have been proposed, but none has become an unambiguous, confirmed example. In a recent SETI Live conversation, host Dr. Franck Marchis spoke with Universidad Diego…...
Scientists Forced Water Into a Bizarre New State of Matter That May Explain Uranus and Neptune’s Strange Mgnetic Fields
10+ hour, 50+ min ago (575+ words) What happens to water when the usual rules no longer seem to apply? Scientists have recreated extraordinary conditions in the lab, uncovering a state of matter that could be hiding deep inside distant planets. Scientists have created a bizarre type…...
Ryugu’s Hidden Chemistry Reveals How Space Rocks May Have Delivered Life’s Ingredients To Earth
10+ hour, 50+ min ago (723+ words) Ancient dust from asteroid Ryugu reveals how nitrogen-rich compounds may have formed and survived before reaching young planets. Tiny grains collected from asteroid Ryugu have revealed how nitrogen-rich compounds may have formed and survived in space before reaching young planets....
The closest planet to our sun is shrinking. Here’s what that means
12+ hour, 50+ min ago (892+ words) Telltale wrinkles that cover Mercury, the closest planet to the sun, suggest it was once a larger world that has shrunk in size — and it may be shrinking more than scientists realized. Related video above: New images of the sun…...