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1932

In Review

Processed color view of Jovian moon Europa showing cracks, ridges and disrupted terrain on the icy surface. From Galileo spacecraft.
Physical World

New projects broaden the search for alien signals from space

A longer list of Earth-like planets, eavesdropping on radio waves and looking for laser light shows: All raise the chances of detecting E.T.

Spectrogram shows a subtle, curved signal discernible from background noise.
Physical World

Physicists probe validity of Einstein’s gravity on cosmic scales

New tests could verify general theory of relativity, or find flaws

Illustration shows how the mass of a large star warps the flat geometry of spacetime, illustrated as a contoured space.
Physical World

A quantum origin for spacetime

Physicists find hints that entanglement explains Einstein’s equations for gravity

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