Russia backed out of a deal to dispose of it. Now what?
NASA's mission to Jupiter is brought to you by: the Sun, from 500 million miles away
Definitely plutonium, risks known.
The Department of Energy has an idea that could double production
New video from the White House touts the accord using physics
Plutonium-238 is still in really short supply
Our dangerously depleted supply of spacecraft fuel just got a little bump from the Department of Energy.
A long-forgotten physics paper holds the secret
As rare-earth metals become less common, and as nuclear non-proliferation treaties proliferate, it may get harder to send probes into...
Like science, tech, and DIY projects?
Sign up to receive Popular Science's emails and get the highlights.