Multiverse

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.

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.