Energy from radiation can move into a window in the day time, and out of the same window at night.

He returned, his skin black from radiation, like a man who had seen the sun, to report that there was no core.

"But in many ways humans can protect themselves from radiation," he said.

A major focus was on gaining a better understanding of how to protect crew members from radiation while working and living in space.

The main problem with this design is lack of protection from cosmic radiation.

"I can't stand by and see them roast from solar radiation."

In order not to crash, he had to get every degree of energy possible from solar radiation.

Other investigators asked whether there might be risks from radiation.

With nuclear weapons there is also damage from intense heat and radiation.

Side effects from radiation are usually limited to the area of the patient's body that is under treatment.