He regarded this region as a "cometary reservoir," containing perhaps a hundred billion comets.

Forty-five years ago, the astronomer Dr. Gerard Kuiper theorized such a cometary reservoir, which is now known as the Kuiper Belt.

She's interested in cometary reservoirs.

For one thing, he said they made a "strong circumstantial case" that Chiron had escaped from a cometary reservoir known as the Kuiper disk.

Another possibility", and the resonant tone indicated that this was most unlikely, "is that it passed through attenuated portions of this cometary reservoir.