At least in the US of A. (Memorial Day, May 31) The reason for concern is the
discovery of natural Plutonium in deep sea sediment.
Spoiler alert:"These stars are not subtle. We know exactly where they are," says Fields, "and there are none that are threatening us today."
Here's a
link to my favorite Space-related news source for a more through explanation of the possible "events" required to develop these Plutonium atoms.
