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Scientists Calculated How Long a Moon City Could Survive. The Results Aren’t Great.
A new study suggests a million-person lunar city could exhaust even an optimistic water supply within a century, despite extensive recycling.
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Mercury Is Slowly Collapsing in on Itself, and It’s Worse Than We Thought
New research suggests Mercury has shrunk more than previously estimated as its cooling core causes the planet’s surface to contract.
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Scientists May Have Finally Figured Out Why Astronauts Get Constipated in Space
A new study suggests microgravity changes how gut bacteria process food, slowing digestion and making constipation more likely.
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Photo: SCIEPRO / Getty Images Earth Is Getting a Front-Row Seat to One of the Rarest Asteroid Flybys Ever
NASA says the asteroid Apophis won’t hit Earth, but its ultra-close flyby could be visible to billions of people.
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Earth’s Orbit Is Full of Hidden Space Junk, and Some of It Could Threaten Modern Life
Researchers found previously undetected debris near geosynchronous orbit, where critical communications and weather satellites operate.
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Scientists Say Some Ejected Comets Could Return to Our Solar System
Researchers say rare “quasi-interstellar objects” could be comets ejected by our solar system that eventually return after drifting through the galaxy.
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Good News! The Sun Might Not Eat Earth After All, According to New Simulations.
New simulations suggest Earth may avoid being engulfed by the Sun, though the planet would still become uninhabitable long before then.
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Photo: lixu / Getty Images 3 Reasons Scientists Think Aliens Stay Away from Earth
About a third of the public believes they’re already here.
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Venus and Jupiter Will Almost Touch in the Sky Tonight. Here’s How to See It.
The two brightest planets in the night sky will almost touch tonight, and no telescope is required to see it yourself.
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Japan Sent a Probe to Collect Samples From an Asteroid. That Asteroid Might Actually Be a Derelict Soviet Spacecraft.
The mysterious object known as 1998 KY26 could be a tiny asteroid, a dark comet, or maybe one very lost Soviet probe.
