A new study proposes that a crash between Titan and another moon spawned Hyperion and, much later, destabilized Saturn’s inner moons into rings. More

Life needs nutrients like nitrogen and phosphorus. But without the right balance of oxygen, these elements get locked away in planets’ cores. More

A collapsed lava tube detected in 30-year-old radar data from Venus may be part of a much wider network of underground caves. More

A rocky exoplanet in the LHS 1903 system defies planet formation models, hinting that gravitational upheaval reshaped the red dwarf’s four worlds. More

Pulsating remnants of stars hint at a clump of invisible matter thought to be about 10 million times the sun’s mass. More