Extragalactic used in a sentence

Extragalactic in a sentence as an adjective

The theory itself is fine, it's just not a good match for extragalactic observations.

Furthermore, they estimate that nearly all extragalactic cosmic rays that reach Earth come from Centaurus A. So, no huge mystery – indeed a rich area for further research.

"What we know is that gamma-ray photons from extragalactic sources travel in the universe toward Earth, where they can be absorbed by interacting with the photons from starlight," Ajello said.

This and other distinct observational differences show that FRBs are excellent candidates for genuine extragalactic transients.

Your starting point for extragalactic GW sources would be a "swiss cheese" like Einsten-Straus 1931 with multiple vacuoles and then combine that with a pp-wave, probably perturbatively, ideas which have been explored in the literature although usually in cosmological/primordial GW contexts [3].