A cometary impact on Cerberus, the planet orbiting the neutron star.

One of the questions raised by the cometary impacts on Jupiter is why the impact spots looked black.

For all we know, these cometary impacts could create some new red spots on Jupiter.

My personal robot, Donald 111, is at work on the preliminary preparations for the cometary impact.

In book two it is hinted that the original cause might be a large-scale nuclear war or a cometary impact.

Some have speculated that this magnetic field and the patterns were created by cometary impacts.

Nevertheless, cometary impacts in particular may have contributed volatiles to the planet.

The cometary impacts have all occurred on the back side of Jupiter, not directly visible from Earth.

It is almost certain that, during the Earth's early history, the planet was a frequent victim of cometary impacts.

The book described the circumstances leading to the discovery that the dinosaur extinction was triggered by a cometary impact.