A close flyby by a large comet is proposed in a number of models.

Some of these large comets occasionally speed into the inner solar system, at times lighting Earth's skies.

Most astronomers doubt that any large comets or asteroids have crashed into the Earth in the last 10,000 years.

I struck a large lost comet, as it happened.

He'd found what looked to be a large comet, a ball of frozen gases a good distance to the side.

THE impact of a large comet may or may not have killed off the dinosaurs 65 million years ago.

He does speculate this might be due to the appearance of a large comet during the journey.

The ship gets hit by several comets before getting trapped in one of the larger comets.

The object could turn out to be no more than an extremely large comet heading in.

In 1994, a large comet collided with the planet Jupiter.