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Multi-word Results
| cosmic dust |
very fine particles of matter found in interplanetary space. |
| cosmic noise |
interference from radio waves beyond the earth; galactic noise. |
| cosmic ray |
high energy radiation, consisting primarily of high-energy protons and alpha particles, that primarily originates from outside the solar system. Upon collision with earth's atmosphere, secondary particles can be produced that sometimes reach the earth's surface. |
| cosmic rays |
streams of high-energy charged atomic nuclei or other particles that enter the earth's atmosphere from outer space. |
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