Altogether twelve men reached the Moon's surface, the only humans to have been on an extraterrestrial body.

Among them, he said, would be an impact with some huge extraterrestrial body, like the comet Chiron, which has a diameter of 150 miles.

Altogether 12 men walked on the Moon, the only humans to have been on an extraterrestrial body.

The impact of a comet or another extraterrestrial body has also been suggested.

All the earth is compacted into an extraterrestrial body, floating in the sky, trapping everything and anything within it.

The Moon is the only extraterrestrial body for which we possess samples with a known geologic context.

It is often detected via spectroscopy in extraterrestrial bodies, including comets and certain stars.

It has been extensively explored by spacecraft and is the only extraterrestrial body on which men have stood.

This was the first time a chemical element was discovered on an extraterrestrial body before being found on the earth.

The first water found on an extraterrestrial body!