Exploding stars left recent, radioactive mark on Earth By Jonathan Webb

[Notebook]

http://www.bbc.co.uk/news/science-environment-35976498

Two new studies confirm that multiple exploding stars, called supernovae, have showered the Earth with radiation within the last few million years.

One study reports traces of radioactive iron-60, a strong indicator of supernova debris, found buried in the sea floor right across the globe.

A second paper models which specific supernovae are most likely to have splattered this isotope across our historic, galactic neighbourhood.

Just looking at the first graphic "Modelling the distribution of iron-60 in the local bubble; "X" marks the Solar System "
Wish they had given some axis and scale.

They might well have in the papers, but that's hard work!