例句與造句

1. Sooner or later, an active comet is spent.
2. Both astronomers are also active comet-hunters.
3. It is the first object that is not an active comet discovered on an orbit typical of long-period comets.
4. This could be caused by an outgassing of H at a rate of about 10  " 4 that for an active comet.
5. On Nov . 12, 2003, the spacecraft is to fly by an older, less active comet called Encke, which was first spotted in 1786.
6. It's difficult to find active comet in a sentence. 用active comet造句挺難的
7. But eventually, astronomers believe, most comets do burn out, and the peculiar object called 1996 PW may be just such a dormant hulk of a once-active comet.
8. Recently, Peter Jenniskens has argued that most of our short-period meteor showers are not from the normal water vapor drag of active comets, but the product of infrequent disintegrations, when large chunks break off a mostly dormant comet.
9. _Under consideration : Deep Space 3, which would fly three telescopes in precise formation around the sun to hunt for planets around other stars, and Deep Space 4, which would land a spacecraft on the nucleus of an active comet and possibly return a sample of the frozen matter to Earth.