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NASA said Mars meteorite ALH84001 held fossils in 1996. Set beside Perseverance's 2025 Cheyava Falls find, it shows what any Mars life claim must now survive.

Kepler's supernova of 1604 was the last one anyone saw in the Milky Way, but not the last to explode. Here is how dust hid others, and how the next one will be caught.

The ashen glow on a thin crescent Moon is sunlight bounced off Earth. Decades of measuring that earthshine revealed something unsettling: the planet is reflecting less light.

Saturn's main rings span about 273,600 km yet are typically only 10 meters thick. Run the math and the famous paper comparison undersells them by a factor of roughly 10,000.

Algol dims every 2.87 days, but its real puzzle is stranger: the lighter star is the older one. Here is how a star gave its mass away and flipped the rules of stellar aging.

"Pluto is roughly twenty times farther away, yet BepiColombo needed eight years to reach Mercury. The culprit is braking, not distance, and it makes Mercury costlier to reach than Pluto.

Thousands of dehydrated tardigrades crashed into the Moon aboard Beresheet in 2019. The impact physics says they died — and a tun with no liquid water to revive in was never alive anyway.

The night sky is dark mainly because the universe has a finite age, not because the Sun set. The blazing sky an infinite universe would give us is still there, stretched into invisible microwaves.

Asteroid 2025 PN7 has shadowed Earth since roughly 1955 — but it is a quasi-moon, not a second moon. How a 19-metre rock hid for 70 years, and why the dates disagree.

Six articles in the New York Sun claimed Sir John Herschel had found winged humanoids on the Moon. The physics of his real telescope disproves it in one line of arithmetic.

On August 12, 2026, the Moon's shadow crosses Greenland, Iceland and northern Spain. Here is where totality falls, the verified times, and the one safety rule that matters.

In 1859 a solar storm set telegraph wires on fire and lit auroras over the tropics. The unsettling part is how much more we have to lose if it happens again.

On July 17, 2026, a 3-day-old crescent Moon pairs with brilliant Venus in the western twilight. They look like neighbors. They are separated by 139 million kilometres.

JWST picked up a possible dimethyl sulfide signal on K2-18b — but a tentative, contested 3-sigma whisper is not confirmed alien life. Here is what the data actually shows.

A supergiant in Andromeda dimmed 10,000-fold and disappeared with no supernova. The numbers behind this 'failed supernova' point to a black hole born in silence.

JWST built the sharpest map yet of the universe's invisible dark matter scaffolding. Here's what it actually shows, what the headlines got wrong, and why depth beat width.

The particles drilling through your body right now didn't come from the Sun. They were flung out of exploding stars that died before humans existed — and they only survive the trip because of Einstein.

Mars was never a dead rock. NASA's MAVEN orbiter, declared lost in June 2026, caught the Sun stripping Mars's air in the act — and tied that theft to vanished oceans.

The Moon sits just 1.3 light-seconds from Earth — close enough to talk to, far enough that every Apollo conversation carried a built-in 2.6-second pause.

Shrink the Sun to a 0.5mm grain of sand and Proxima Centauri sits roughly 9 miles away — yet the space between them contains almost nothing. Here's what that tells us about cosmic emptiness.

A YouTuber building a replica helped scientists crack the Antikythera mechanism's last great mystery. Here's what the 2,000-year-old eclipse computer can now tell us.

For the first time, the James Webb Space Telescope has directly characterized the surface of a rocky exoplanet, and what it found is a dark, basalt-covered world with no atmosphere — eerily similar to the Moon.

NASA's James Webb Space Telescope detected methane and carbon dioxide in the atmosphere of K2-18b — a temperate sub-Neptune 120 light-years away that may harbor a global ocean.

In 1925, Cecilia Payne proved stars are mostly hydrogen. The most powerful astronomer of the era told her she was wrong. It took four years for science to catch up.

A growing dent in Earth's magnetic shield is frying satellites and splitting in two. Here's what the South Atlantic Anomaly really means for our planet.

NASA's Dragonfly rotorcraft launches in 2028 toward Saturn's moon Titan — a world with methane lakes, a buried ocean, and chemistry that mirrors early Earth.

Gamma Cassiopeiae blazed with X-rays 40 times stronger than expected for half a century. In 2026, the XRISM space telescope finally unmasked the hidden culprit: a ravenous white dwarf.

Around 42,000 years ago, Earth's magnetic field dropped to just 5% of its current strength. Here's what happened to the planet — and to us.

The SMILE satellite is set to launch May 19, 2026, and will capture the first-ever global X-ray image of Earth's magnetosphere — the invisible shield that keeps life on Earth alive.

NASA's Perseverance rover has uncovered wave-formed beaches and carbonate-rich rocks in Jezero Crater — the clearest evidence yet that Mars once had a stable, life-friendly lake shore.

The observable universe spans 93 billion light-years, yet is only 13.8 billion years old. Here's the physics that resolves this mind-bending contradiction.

HD 140283, nicknamed the Methuselah Star, has an age that rivals — and may slightly exceed — the universe itself. Here's how that's possible and what it tells us about cosmic history.

NASA shut off Voyager 1's Low-energy Charged Particles experiment on April 17, 2026. Only two instruments now remain active on humanity's most distant spacecraft.

For the first time since Apollo, humans flew behind the Moon — and witnessed a 57-minute total solar eclipse unlike anything ever seen from Earth.

NASA's James Webb Space Telescope captured the sharpest image ever taken around a black hole, revealing that 87% of the hot dust near the Circinus Galaxy's core is being consumed — not blown away.

Red giants are among the most extreme environments in the universe. Here's the physics of what would actually happen if you crossed into one — layer by layer.

The James Webb Space Telescope is finding black holes in the early universe so massive they outweigh their entire host galaxies — and nobody fully knows how.

White dwarfs are caught consuming their own planetary systems at an alarming rate. New JWST data reveals exactly how it happens — and confirms Earth faces the same fate in 5 billion years.

Every May, Earth slices through the debris trail of Halley's Comet, igniting one of the fastest meteor showers of the year. Here's the science behind the Eta Aquariids.

A Jupiter-sized planet orbiting a tiny M-dwarf star defies everything we know about planet formation — and JWST's atmospheric findings make it even stranger.

NASA's Roman Space Telescope shares Hubble's mirror size but captures 100 times more sky in a single shot — poised to map a billion galaxies and reshape what we know about dark energy.

For the first time since Apollo, humans are orbiting the Moon — and seeing its hidden far side with their own eyes. Here's what the Artemis II crew witnessed.

The Lyrids have blazed across April skies for 2,700 years — and most people have never heard of them. Here's the remarkable story behind the oldest recorded meteor shower still active today.

Artemis II sends four extraordinary astronauts around the Moon — the first crewed lunar mission since 1972. Meet the commander, pilot, and mission specialists breaking barriers in deep space.

Voyager 1 has been flying through interstellar space for nearly 50 years powered by just 69 KB of memory and a physical tape recorder — less computing power than a digital watch.

In 2022, NASA slammed a spacecraft into an asteroid expecting a nudge. What happened next rewrote the rules of planetary defense forever.

New Juno data reveals Jupiter's lightning bolts may reach a million times the power of Earth's — fueled by ammonia storms over 100 km tall.