Does the Multiverse Really Exist?
Proof of parallel universes radically different from our own may still lie beyond the domain of science
Follow the Bouncing Universe
Our universe may have started not with a big bang but with a big bounce—an implosion that triggered an explosion, all driven by exotic quantum-gravitational effects
The Inflation Debate
Is the theory at the heart of modern cosmology deeply flawed?
The Inner Life of Star Clusters
All stars are born in groups but then slowly disperse into space. A new theory seeks to explain how these groups form and fall apart or, in rare cases, persist for hundreds of millions of years
A Geometric Theory of Everything
Deep down, the particles and forces of the universe are a manifestation of exquisite geometry
Is the Universe Leaking Energy?
Total energy must be conserved. Every student of physics learns this fundamental law. The trouble is, it does not apply to the universe as a whole
Is Space Digital?
An experiment going up outside of Chicago will attempt to measure the intimate connections among information, matter and spacetime. If it works, it could rewrite the rules for 21st-century physics
The Far, Far Future of Stars
Some say its glory days are long gone, but the universe has life in it yet. Brand-new types of celestial phenomena will unfold over the coming billions and trillions of years
A shadow cosmos, woven silently into our own, may have its own rich inner life
The Universe's Invisible Hand
Dark energy does more than hurry along the expansion of the universe. It also has a stranglehold on the shape and spacing of galaxies
The Lost Galaxies
By the latest estimate, the observable universe contains 200 billion galaxies. Astronomers wonder: Why so few?
The Longest View
To learn how the universe evolved over time, a space telescope gazes back to the earliest galaxies ever observed
The Dawn of Distant Skies
The galaxy is teeming with planets. Scientists are straining to peer into their atmospheres to seek signs of extraterrestrial life
Goldilocks Black Holes
Tipping the scales at less than about a million suns in mass, middleweight black holes may hold clues to how their much larger siblings, and galaxies, first formed
The Long-Lost Siblings of the Sun
The sun was born in a family of stars. What became of them?
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