Cosmic ice screen

时间:2019-03-08 01:09:04166网络整理admin

THE ices in Comet Hale-Bopp are not formed from the raw stuff of interstellar gas, according to astronomers in the US. Michael DiSanti of NASA’s Goddard Space Flight Center in Greenbelt, Maryland, and his colleagues conducted a spectroscopic survey of the comet. They found that the nucleus contains 12 per cent more carbon monoxide than water—a smaller fraction than found in the cold areas of interstellar molecular clouds, but comparable to levels in the clouds that give birth to stars (Nature, vol 399,