Exploding stars left recent, radioactive mark on Earth

This is pretty interesting.

 

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.

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