A. G. W. Cameron has written:

'Interstellar communication'

Interstellar is when the extinction of things goes interstellar.

The word 'interstellar' in a sentence: The interstellar nebula was huge compared to the asteroid.

"Interstellar" means "between the stars". "Interstellar differences" is not a term commonly used in astronomy.

Douglas A. Vakoch has written:

'Ecofeminism and rhetoric' -- subject(s): Feminist criticism, Ecofeminism

'Communication with extraterrestrial intelligence (ceti)' -- subject(s): Life on other planets, Interstellar communication