If Saturn’s cratered moon Mimas has liquid water beneath its surface, ocean worlds might be far more common in the solar system than we thought.
orbits & rotations
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Giant Planets May Be “Agents of Chaos”
Two studies suggest that some giants could make it difficult or even impossible for terrestrial planets to remain in a star’s habitable zone.
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Five Martian Mysteries That Have Scientists Scratching Their Heads
Despite centuries of study and many spacecraft visits, the Red Planet still holds secrets. Here are just a few.
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A Planet Is Dramatically Losing Its Atmosphere
Helium that was once part of the atmosphere of the extrasolar planet HAT-P-32b is being ripped away and forming two giant streamers of gas several million kilometers long.
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Exoplanets May Support Life in the Terminator Zone
A new study finds that the intersection between a searing dayside and a freezing nightside could be habitable.
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Tides Ripple Across Earth’s Plasma “Donut”
Interactions between lunar gravity and the terrestrial magnetic field may cause a 90° offset from the Moon’s position in its orbit.
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Ice Cores Record Long-Ago Seasons in Antarctica
Researchers used ice core data to reconstruct seasonal temperatures throughout the Holocene. The results link especially hot summers with patterns in Earth’s orbit.
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Marauding Moons Spell Disaster for Some Planets
In solar systems beyond our own, some moons might eventually collide with their host planets, new simulations suggest.
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Quaoar’s Ring Defies Gravity
The dwarf planet’s ring makes astronomers question whether a long-held theory about ring and moon formation needs tweaking.
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Mercury Isn’t Alone in Orbit, and Scientists Don’t Know Why
A cloud of dust traces the innermost planet’s orbital path. By all accounts, it shouldn’t be there.