Chemical traces in ancient hair reveal cannabis was used to get high 2,800 years ago
This extinct bird was several times heavier than the megapodes still living on Flores
Scientists cool atoms to a record 9.7 picokelvin aboard China’s space station
Could the universe be 26.7 billion years old? An alternative theory gives early galaxies billions more years to grow
A 1,000-solar-mass black hole may have grown into a giant without building a galaxy around it
Seven massive star clusters hold at least 80% of a galaxy from the universe’s first 400 million years
Shipwreck survivors may have built a temporary camp on a remote Argentine island in 1873
A gamma-ray burst faded, then its X-ray afterglow suddenly brightened weeks later
Hidden behind Galactic dust, Garro 04 emerges as a 10,000-light-year-distant cluster with shared motion, chemistry and a disk-like orbit
Earth may have kept its oceans and mild climate for billions of years without life
The stars’ 20-day rotation masquerades as planet-like signals in a nearby binary system
Hidden Milky Way star cluster may be 13.4 billion years old, nearly as old as the universe
Betelgeuse grows more oval as its companion star moves through its atmosphere
A rare Celtic warrior helmet was deliberately smashed and buried 2,400 years ago in Poland
In ancient Colombia, dying marine lineages shared the seas with evolutionary newcomers
Snow and ice give northern lakes a stronger cooling effect than nearby land
This 125-million-year-old dinosaur may have grown twice as large as the fossil found in England
Water warming makes young North Pacific water older while old tropical water gets younger
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What Are the Biggest Unsolved Mysteries in Astrophysics and Cosmology?
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Will the Universe End in a Big Freeze, Big Crunch, or Big Rip?
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What Is Space-Time? How Space and Time Form a Four-Dimensional Structure
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What Determines a Star’s Lifetime? Mass, Temperature, and Evolution
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How Do Stars Produce Energy? Nuclear Fusion Explained
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How Do Stars Form? From Giant Gas Clouds to Nuclear Fusion
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What Happens When Two Galaxies Collide?
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Andromeda Galaxy vs. Milky Way: How Our Galaxies Compare
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What Is the Difference Between Spiral, Elliptical, and Irregular Galaxies?
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How Many Galaxies Are in the Observable Universe?
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