Data collected by the Fermi Space Telescope provide conclusive evidence that supernovae are the source of the speedy, energetic particles called cosmic rays, an international research team reports.
These charged particles, which are mostly protons, continuously assail the planet from outer space. There is general consensus among scientists that supernova remnants (the leftovers of a supernova explosion) are the sources of cosmic rays, but the final proof has been elusive because cosmic rays are deflected on their way to Earth.
Ever wonder what other planets are lurking beyond our galaxy? Well, a new planet has been discovered near a star of extragalactic origin, implying that it comes from outside the Milky Way, reports a new study appearing in the 18 November issue of the journal Science Express.
The finding challenges our current understanding of planet formation and survival, since it’s the first time astronomers have found a planet around an extremely metal-poor, ancient star.