原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American 60-Second Science. I'm Lee Billings. Got a minute?
该句暂无译文！
2 .Outer space may look mostly empty, but it's actually packed with cosmic radiation,
该句暂无译文！
3 .gamma rays and charged particles produced by exploding stars, black holes and other violent astrophysical phenomena.
该句暂无译文！
4 .Earth's atmosphere and magnetic field keep us safe from the worst of this steady barrage of subatomic bullets.
该句暂无译文！
5 .But cosmic radiation would be a constant concern for astronauts on lengthy interplanetary voyages.
该句暂无译文！
6 .NASA and other space agencies have known for decades that this radiation can cause cancer and other cell damage.
该句暂无译文！
7 .However, possible effects on mental functioning have been difficult to test.
该句暂无译文！
8 .But a new study shows that, in mice at least, cosmic radiation likely causes cognitive impairment.
该句暂无译文！
9 .The research is in the journal Science Advances.
该句暂无译文！
10 .The researchers mimicked cosmic-radiation exposure by briefly bombarding the brains of lab mice with high-energy particles.
该句暂无译文！
11 .Six weeks later, the mice scored poorly on tests of learning and memory,
该句暂无译文！
12 .they displayed less curiosity and more confusion than an unexposed control group.
该句暂无译文！
13 .Analysis of their brains revealed inflammation and decreased numbers of dendrites, which transmit signals between nerves.
该句暂无译文！
14 .If humans are similarly susceptible, astronauts on voyages to Mars could suffer permanent cognitive impairment that could hinder their abilities to recall information and to think on their feet.
该句暂无译文！
15 .Faster transits, new antiradiation drugs and better spacecraft shielding should help.
该句暂无译文！
16 .But until those solutions are developed, sending brain-damaged humans to Mars would be a dim-witted thing to do.
该句暂无译文！
17 .Thanks for the minute, for Scientific American's 60-Second Science. I'm Lee Billings.
该句暂无译文！