A billion-dollar exoplanet hunter must prove it won't sabotage itself when all systems fire simultaneously in the void.
Decades of cosmic detective work unravels when a mysterious radio structure turns out to be much closer—and far less dramatic—than astronomers believed.
The Soviets sent a probe to Venus expecting minutes. It kept working long enough to rewrite planetary science.
For 48 minutes of every 2-hour orbit, Michael Collins flew alone behind the Moon, cut off from Earth and his crewmates by 2,000 miles of rock — the most physically isolated human being in history, and by his own account not lonely but quietly content.
The conditions for life may not require starlight at all—just the right moon orbiting the right rogue planet.
What ground control dismissed as static turned out to be humanity's first whisper from another world.
A dying world's cooling core is literally pulling its skin tight, creating dramatic geological scars that reveal how planets age.
The cosmos's dustiest rebels: ancient stars in a metal-poor galaxy are forging heavy elements astronomers thought impossible without cosmic maturity.
Voyager 1 is often imagined as a spacecraft still pushing itself outward, an engine burning faintly somewhere beyond the planets.
A planet can orbit two stars without being strange in fiction. The strange part is finding one in a real telescope image, tucked far closer to its twin suns than astronomers thought such a directly photographed world ought to be.
In 1984, Soviet cardiologist Oleg Atkov spent 237 days aboard Salyut 7 with a portable echocardiography unit, producing what appear to be the first real-time ultrasound images of a human heart remodeling in microgravity — and founding a tradition of orbital imaging that still guides ISS medicine today.
NASA has reduced one of the strangest milestones in human engineering to a timestamp.
Most comets are treated as leftovers from a local story. They formed with the planets, spent billions of years in the cold outskirts of the Solar System, and occasionally fall inward, warming just enough for sunlight to pull gas and dust from their surfaces.
The Pentagon is assembling a satellite network engineered to be nearly impossible to destroy: hundreds of small, cheap spacecraft in low Earth orbit, each replaceable within months, packed densely enough that losing any single one changes almost nothing.
The simplest picture treats dark energy as a constant. DESI's 2025 galaxy survey, combined with other data, hints instead that it was stronger in the past and has been weakening, though the signal is not yet at the level physicists call a discovery.
On March 31, 2025, four first-time astronauts flying the first human mission ever to loop directly over Earth's poles carried a commercial off-the-shelf X-ray…
