Why must humans limit their exposure to X-rays and gamma rays? A. These rays act similarly to microwaves on the human body.
B. Exposure can cause the human body to give off heat.
C. The rays can change molecules and atoms in the body into ions.
D. Even a small amount of radiation can burn the skin.
The answer is C. The rays can change molecules and atoms in the body into ions.

The US Environmental Protection Agency (EPA) sets limits for exposure to x-rays and gamma rays in part because it recognizes that this form of radiation can cause cancer.

from 1609, galileo galilei used the recently invented telescope to observe the sun, moon and planets. he saw the mountains and craters of the moon, and for the first time revealed the planets to be worlds in their own right. galileo also provided strong observational evidence that planets orbited the sun.

his discoveries about the moon, jupiter's moons, venus, and sunspots supported the idea that the sun - not the earth - was the center of the universe, as was commonly believed at the time.galileo turned his gaze toward venus, the brightest celestial object in the sky - other than the sun and the moon.

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