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Wiktionary
extragalactic

a. (context astronomy English) Originating outside of the Milky Way galaxy.

WordNet
extragalactic

adj. outside or beyond a galaxy; "extragalactic nebula"

Usage examples of "extragalactic".

That belief, that this was merely an extragalactic lump of rock, perhaps even a lump of rock from their own galaxy that had somehow escaped and then got pulled back in, did little to temper the excitement, though.

Before this moment, no one had ever witnessed evidence of, let alone the actual event of, an extragalactic breach.

Was it connection or coincidence that the disease within Mara and the others had shown up when it did, so near to an extragalactic invasion?

She had seen these extragalactic aliens, the Yuuzhan Vong, up close, and understood that the threat, though apparently ended on any large scale, could not be ignored.

Since the destruction of Ygziir, Nom Anor's people had learned to easily counter the tactic, but these infidels, without understanding of the extragalactic creatures, and without the countering powers of other dovin basals, would have no way to determine the source of impending disaster - and they would not have the firepower to defeat it.

This extragalactic station has it all spelled out, but it's pretty complicated.

But about people, now—this entire program is taken from the major extragalactic station.

This was one more evidence of the superiority of the extragalactic technology: the traveler could not be jammed or blocked or diverted.

This came in the form of an extragalactic broadcast that intercepted the galaxy broadside and thus saturated it within a few thousand years.

The first concerted extragalactic exploration was undertaken, and entire civilized planets made the jump into deep space.

They were trying to measure how the number of distant extragalactic radio sources increased as they looked deeper into space.

Some important discoveries had been made -- on the extragalactic objects that seemed, paradoxically, to be moving faster than light.

As with many extragalactic radio sources, two enormous jets of gas, fleeing apart at almost the speed of tight, were making a complex web of Rankine-Hugoniot shock fronts with the thin intergalactic gas -- and producing in the process a radio beacon that shone brightly over most of the universe.

Among the objects to be examined were the vicinity of Sagittarius A at the center of the Galaxy, and the great extragalactic radio source, Cygnus A.

Some important discoveries had been made--on the extragalactic objects that seemed, paradoxically, to be moving faster than light.