SSS 2010-06-15
时间：2019-01-08 作者：英语课 分类：Scientific American(六)月
When astronaut Alan Shepard took his first swing at a golf ball on the moon, he hit more dirt than ball. The dust he kicked up reinforced the idea that the moon is one big sand trap. But looks can be deceiving. Now, scientists reanalyzing lunar samples say that our satellite is at least a hundred times wetter than we thought. The results appear in the Proceedings 1 of the National Academy of Sciences.
Astronauts manning the Apollo missions brought home plenty of moon rocks. And in 40 years of looking at those samples, no one ever found a trace of water. That could be because the collision that made the moon in the first place was so hot that volatile 2 elements like hydrogen, a key component 3 of H2O, largely burned away.
Now, using a technique that can identify elements present in just a few parts-per-billion, scientists have taken another look at three lunar samples, two from Apollo missions and one meteorite 4 found in Africa. And they detected hydroxyl, the HO that’s left behind when a rock crystallizes from magma containing water.
The results suggest that water may be ubiquitous in the interior of the moon. Although there’s probably not enough to qualify as a water hazard.
Thanks for the minute for Scientific American's 60-Second Science. I'm Karen Hopkin.
- He was released on bail pending committal proceedings. 他交保获释正在候审。
- to initiate legal proceedings against sb 对某人提起诉讼
- With the markets being so volatile,investments are at great risk.由于市场那么变化不定，投资冒着很大的风险。
- His character was weak and volatile.他这个人意志薄弱，喜怒无常。
- Each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
- Blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。