What we need to do to prepare for a nuclear event

As we observe the 70th anniversary of the bombings of Hiroshima and Nagasaki, it may seem like the threat from nuclear weapons has receded. But it hasn't; the threat is actually increasing steadily. This is difficult to face ...

History is the key to making sense of nuclear weapons

In the early days of his first term, US president Barack Obama gave a speech in Prague in which he called for a world without nuclear weapons. His argument was based on a risk assessment:

A brief history of nukes in space

In just a few short weeks, NASA's New Horizons spacecraft will make its historic flyby of Pluto and its moons. Solar panels are unable to operate in the dim nether regions of the outer solar system, and instead, New Horizons ...

Probing what happens to plutonium in a nuclear explosion

For years, research on nuclear weapons has relied on old data, limited experiments and computer modeling. But this year, that pattern has changed. Scientists have run new experiments that simulate what happens to plutonium ...

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