The most common of these bursts do not appear to be coming from any known objects.

The number of known trans-Neptunian objects increases almost every month.

The largest of the known objects is about four miles across, but most are quite a bit smaller.

The first known object to come from beyond the stars ought to be examined.

At that time this comet had passed closer to the sun than any other known object.

This is a record close approach for a known object of this size.

Estimated to be one and a half million years old, this is the oldest known object shaped by man.

The same object can be measured in comparison to known objects by mass.

Laid out before us is a collection of every known object used by man in the course of living.

These bursts have yet to be linked with any known object in the universe.