long period comet

A long-period comet will take more than 200 years to orbit.

The slightest error, and we'd either burn up, or become a long-period comet.

This is a long-period comet (it will not return to earth for a long time).

Prophecy is possible using scientific laws, where sufficiently simple events are concerned: the eclipse of a sun, or the return of a long-period comet.

It's got the orbital characteristics of a long-period comet - but none of the physical characteristics.

Like a long-period comet, 1996 PW takes about 7,000 years to complete just one orbit.

The parent body, probably a long-period comet, is unknown.

This contrasts it with long-period comets, whose orbits last for thousands of years.

Its parent is a previously unknown long-period comet.

Such families are thought to arise from the planet capturing formerly long-period comets into shorter orbits.