Local supernova 2 million years ago solves cosmic ray puzzle

Image credit: NASA/CXC/SAO/Science Photo Library

All signs point to a supernova. A stellar explosion 2 million years ago that flooded our neighbourhood with charged particles could be the answer to several cosmic puzzles.

For years, astrophysicists have struggled to explain why there are so many high-energy cosmic rays – speeding charged particles that hit Earth from all directions.

Read the full article in New Scientist.