The outer boundary of a black hole is called the event horizon.

Six enormous boulders, equidistant from each other, stood around the circle's outer boundary.

The names of the cuts are indicated around the outer boundary of the diagram.

But this time they took the scenic route, coming down at the outer boundary of Hell.

Cracknell behaved as if she had not spoken, pressing on towards the outer boundary of the Belle Vue.

Jupiter, orbiting along an inside track, occasionally raced past Saturn, lumbering along on the outer boundary of the solar system.

In one direction Reid finds himself led to the outer boundary of the body, where sense perception has its origin.

Several destroyers and light cruisers were on the outer boundary of the formation, screening higher-value units farther inside the formation.

For it is cut from the rock on the left-hand side, while its outer boundary is marked at intervals by white stones.

But the accursed Chertanovo seemed to be the frontier post marking the precise outer boundary of the human domain in the Metro.

That belt of battlements studded with square towers, straggling round the whole brow of the hill, is the outer boundary of the fortress.

She supposed this outer boundary could be breached more easily, but she had no doubt there were sensors that would indicate any intruder.

What few sad fruit trees and root crops I had seen had no place past the town's outer boundary; now, there was only the wilds.

This constitutes proof that the scientific paradigm has met its outer boundaries.

A cold presence with a feel of great age grazed the outer boundaries of his seeking mind.

Forestry surrounds the outer boundaries of the fields with some old woodland and some recently planted trees.