Assertion: cosmic ray | /r/HasProperty | subatomic particles
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Source sentences:
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: In high-energy physics, an ultra-high-energy cosmic ray (UHECR) or extreme-energy cosmic ray (EECR) is a cosmic ray (subatomic particle) which appears to have extreme kinetic energy, far beyond both its rest mass and energies typical of other cosmic rays.
text: Cosmic rays are subatomic particles flying through space at great speed in all directions.
text: Cosmic rays are subatomic particles that move through space at nearly the speed of light.
text: Cosmic rays are subatomic particles, made up of around ninety percent protons, that move through space at close to the speed of light.