What are cosmic rays?
A. another name for gamma rays and X-rays
B. fast moving dust particles in the interstellar medium
C. subatomic particles that travel close to the speed of light
D. lasers used as weapons by extraterrestrials
Answer:C
What are cosmic rays?
A. another name for gamma rays and X-rays B. fast moving dust particles in the interstellar medium C. subatomic particles that travel close to the speed of light D. lasers used as weapons by extraterrestrials