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Planetary Science & Exoplanets
Worlds near and far—atmospheres, habitability, and planetary formation.
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People think Earth dies when the Sun becomes a red giant in five billion years — the more likely end is a billion years from now, when a star already 30 percent brighter than at birth pushes CO₂ too low for C3 plants, then a moist greenhouse strips the oceans of hydrogen and leaves a sterile Venus
10+ hour, 2+ min ago (431+ words) The popular ending is fire. The actual ending is a slow loss of air that plants can breathe, then of water that can come back....
Astrophysics study suggests Venus may have swallowed its moon
1+ day, 4+ hour ago (555+ words) A California-based astrophysicist has presented a new theory to explain why Venus, the planet most like Earth in size, mass and structure, lacks its own moon. Call it a case of celestial cannibalism. The extremely slow speed at which Venus…...
Moons That Were Shattered and Rebuilt from Debris May Still Be Hiding Oceans Beneath Their Ice
6+ hour, 33+ min ago (763+ words) Beneath the ice of some of the solar system's most intriguing moons, vast oceans may be hiding, and they may be among our best chances of finding life beyond Earth. But some of these worlds were once torn apart by…...
Where does a planet end and a star begin? Webb found a free-floating brown dwarf only about twice Jupiter’s mass, surrounded by a disk of planet-forming material — an object with a planet’s mass that appears to have formed like a star.
12+ hour, 37+ min ago (1201+ words) Webb spectroscopy identifies a roughly two-Jupiter-mass IC 348 member with infrared excess from a disk, while spatial evidence favors star-like formation over planetary ejection....
The Asteroid That Killed the Dinosaurs Was Stranger Than We Thought
22+ hour, 54+ min ago (87+ words) Scientists are narrowing down the type of space rock that caused the mass extinction at the end of the Cretaceous period, and new research suggests it was no ordinary rock....
Scientists Rewrite the Atomic Structure of Glass While It Melts
1+ day, 3+ hour ago (159+ words) Researchers can now rewrite glass chemistry while it is still molten, unlocking properties that extreme heat once made impossible....
New details about a major solar storm rewrite space weather history
1+ day, 10+ hour ago (935+ words) A 175-year-old mistake about a major solar storm has been uncovered, changing the timeline of space weather’s earliest impacts on technology. A train getting ready to leave a station in southwest England once sat idling. Its telegraph signal had gone…...
During the Solar System’s first million years, its earliest outer worlds formed from material that was up to 92 percent heat-forged rock, while gas flowing through the young system filtered out much of the surrounding ice-rich dust.
1+ day, 2+ hour ago (1245+ words) Two chemical tracers in carbonaceous iron meteorites indicate that the earliest outer Solar System planetesimals contained only 8 to 17 percent fine matrix, extending aerodynamic sorting to the opening era of planet formation....
NASA Struck Mars 5 Times, What the Craters Revealed Stunned Scientists
1+ day, 4+ hour ago (794+ words) NASA spacecraft debris created five fresh craters on Mars, allowing scientists to measure the strength of the planet’s surface in an unexpected way. NASA’s Perseverance rover mission unintentionally created five impact craters on Mars, giving scientists a rare opportunity to…...