Assertion: cosmic ray | /r/HasProperty | accelerated
Facets:
value: to near the speed of light
type: OTHER
Source sentences:
text: The remnants of the explosions  expanding clouds of gas and magnetic field  can last for thousands of years, and this is where cosmic rays are accelerated.
text: Today, scientists know that cosmic rays are atoms and subatomic particles that are accelerated to near the speed of light, most likely by supernova explosions.
text: There is considerable evidence that cosmic rays are accelerated as the shock waves from these explosions travel through the surrounding interstellar gas.