comet

They found that there are roughly 1,900 hydrogen atoms for each deuterium atom in the water on Comet 67P.

The probe appears to be sitting at the bottom of a "cliff" on the comet, but beyond that it's hard to tell.

The basic approach went as planned: after separating from the Rosetta orbiter, Philae coasted slowly to the comet surface.

Landing on any other world is hard, but Comet 67P is especially challenging, even apart from the low gravity.

The comet is basically shaped like a rubber ducky, but with a much rougher surface.

The Comet started on her first trip up the Arkansas, being the first steam boat that ascended that river.

By the time he reached the bridge the cylinders were purring softly and the Comet was going like a limited express.

Here Matt's wisdom in bringing Clip along, even at the loss of some speed on the Comet's part, was made manifest.

Jem, the driver of the roadster, crashed through the bushes just as the Comet was getting under its own headway.

With all the reserve power thrown into the machinery, the Comet made hard work of the hill.