The Earth is constantly bombarded with neutrinos from the sun. However, neutrinos from beyond the solar system can be millions or billions of times more energetic.
Washington Last Updated: November 14, 2014 | 14:43 IST
An artist's illustration shows a supermassive black hole with millions to billions times the mass of our sun at the center, surrounded by matter flowing onto the black hole in what is termed an accretion disk in this NASA illustration. Photo: Reuters