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Earth

How earthquake scientists eavesdrop on North Korea’s nuclear blasts

Researchers monitor the power and location of underground nuclear weapons testing by North Korea.

Astronomy

‘Making Contact’ chronicles an astronomer’s struggle to find E.T.

For decades, astronomer Jill Tarter led the hunt for extraterrestrial intelligence, as detailed in a new biography.

Astronomy

Fewer big rogue planets roam the galaxy, recount shows

Jupiter-mass planets without parent solar systems are less common than astronomers thought, a new study suggests.

Chemistry

Radioactive substances leave electron ‘fingerprints’ behind

A new method of nuclear forensics could make it harder to handle radioactive material in secret.