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Scientists report the possible discovery of primordial gravitational waves, ripples in space-time that carry a record of how the universe began.
New calculations suggest physicists may someday discover a fundamental theory of gravity, but it could require a radical new perspective on the universe.
Physicists have devised experiments that can probe the interface between quantum mechanics and general relativity.
Physicists have discovered a jewel-shaped geometric object that challenges the notion that space and time are fundamental constituents of nature.
Theoretical cosmologists are piecing together a cosmic origin story from a surprising anomaly in the recently released Planck satellite image.
Decades of confounding experiments have physicists considering a startling possibility: The universe might not make sense.
An interview with the Nobel Prize-winner David J. Gross on the confusing state of theoretical physics.
If a new hypothesis about black hole firewalls proves correct, at least one of three cherished notions in theoretical physics must be wrong.
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