SSS 2008-06-23（在线收听）

This is Scientific American's 60-Second Science. I'm Steve Mirsky. Got a minute?

On June 4th we told you about iron snowflakes on Mercury. Today we have some radical news about the atmosphere of Venus. Literally, a radical is a molecule that reacts easily with other chemicals because of an unpaired electron. Astronomers have found the hydroxyl radical in the Venusian atmosphere. Hydroxyl is oxygen with a single hydrogen H1O, if you like. The Venus Express probe discovered hydroxyl in the clouds that shroud the planet. Researchers from the European Space Agency announced the finding in the journal Astronomy and Astrophysics Letters. Hydroxyl is important on Earth, because it promotes the formation of ground-level ozone, a pollutant. Finding the radical on Venus will help scientists test their models of Venus’s atmosphere. Hydroxyl also exists in the thin Martian atmosphere where it’s thought to stabilize carbon dioxide and prevent it from becoming carbon monoxide. It may also be responsible for sterilizing the red planet’s top layers of soil.

Thanks for the minute for Scientific American’s 60-Second Science, I’m Steve Mirsky.