On August 17, 2017 the LIGO and Virgo collaboration measured a gravitational wave originating from a binary neutron star merger.
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Ever since the existence of cosmic rays with individual energies of several Joules was established in the 1960s, speculation has raged as to whether cosmic particles of mean energy of 2 Joules are created in our Milky Way or in distant extragalactic objects.
Interesting article in the October 2016 issue of the American bi-weekly magazine ScienceNews.
Are you interested in brushing up your Danish? Read a feature article on the Pierre Auger Observatory.
July 31, 2018 – A new article on UHECRs has appeared in Physics World
Cosmic rays are mostly charged particles that reach Earth from outer space.