Planets
Huge polygons on Mars hint its equator may once have been frozen
A Chinese rover used radar to reveal long-buried terrain. The discovery hints that Mars’ equator was once much colder and wetter.
By Elise Cutts
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A Chinese rover used radar to reveal long-buried terrain. The discovery hints that Mars’ equator was once much colder and wetter.
Infrared light from a distant star appears to be leftovers of an impact between a pair of Neptune-sized worlds.
The sun will be near the peak of its activity cycle during the eclipse on April 8, 2024. That will make it a great time to crowdsource solar research.
Emerging evidence points to the existence of rogue black holes and other cosmic oddities — such as big black holes in tiny galaxies.
Observations of dead stars hint that ripples in spacetime — ripples light-years long — roll through our universe.
A burst of light and a cloud of dust are signs that a distant star swallowed a giant planet.
The inner workings of microscopes, telescopes, eyeglasses and other lens-based devices rely on two important laws of optics.
But should moon time be like Earth time — or quite different? At issue: The moon’s lesser gravity will make seconds there tick faster than on Earth.
A hypothetical planet slamming into Earth 4.5 billion years ago might have set subduction into motion.
The unusual, fruit-inspired structure of this material provides quick filtration that could satisfy people's daily water needs.