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Cosmic ray sources
Most cosmic rays originate from extrasolar sources within our own galaxy such as rotating neutron stars, supernovae, and black holes.
Anomalous cosmic rays
Anomalous cosmic rays (ACRs) are cosmic rays with unexpectedly low energies. They are thought to be created near the edge of our solar system, in the heliosheath, the border region between the heliosphere and the interstellar medium. When electrically neutral atoms are able to enter the heliosheath (being unaffected by its magnetic fields) subsequently become ionized, they are thought to be accelerated into low-energy cosmic rays by the solar wind's termination shock which marks the inner edge of the heliosheath. It is also possible that high energy galactic cosmic rays which hit the shock front of the solar wind near the heliopause might be decelerated, resulting in their transformation into lower-energy anomalous cosmic rays.
Originally posted by AceWombat04
What makes this supernova of particular interest apparently is that it appears to be the most recent one ever to occur in our galaxy.
140 years ago is extremely recent, relatively speaking. I won't pretend to understand the implications, but I can see how it could be important to science.
Originally posted by shramana
ITEM 1 - DISCOVERY OF MOST RECENT SUPERNOVA IN OUR GALAXY - CXC (NEW) The most recent supernova in our Galaxy, known as G1.9+0.3, has been discovered by tracking the rapid expansion of its remains. This result, using NASA's Chandra X-ray Observatory and NRAO's Very Large Array (VLA), has implications for understanding how often supernovas explode in the Milky Way galaxy.