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Infinity and Beyond: The Ultimate Test

In a Multiverse, What Are the Odds?

Testing the multiverse hypothesis requires measuring whether our universe is statistically typical among the infinite variety of universes. But infinity does a number on statistics.

theoretical physics

At Multiverse Impasse, a New Theory of Scale

Physicists have begun to explore the idea that mass and length may not be fundamental properties of nature. The hypothesis could help to avoid the conclusion that our world is just a weird bubble in an endlessly foaming multiverse.


Lopsided Map Offers Clues to Big Bang

Theoretical cosmologists are piecing together a cosmic origin story from a surprising anomaly in the recently released Planck satellite image.

theoretical physics

Is Nature Unnatural?

Decades of confounding experiments have physicists considering a startling possibility: The universe might not make sense.


Waiting for the Revolution

An interview with the Nobel Prize-winner David J. Gross on the confusing state of theoretical physics.