a rocket-propelled guided missile that can escape the earth's atmosphere; makes observations of the solar system that cannot be made by terrestrial observation
that time; that moment; "we will arrive before then"; "we were friends from then on"
subsequently or soon afterward (often used as sentence connectors); "then he left"; "go left first, then right"; "first came lightning, then thunder"; "we watched the late movie and then went to bed"; "and so home and to bed"
at that time; "I was young then"; "prices were lower back then"; "science as it was then taught"
in that case or as a consequence; "if he didn't take it, then who did?"; "keep it then if you want to"; "the case, then, is closed"; "you've made up your mind then?"; "then you'll be rich"
in addition; "agreed to provide essentials but nothing beyond"
farther along in space or time or degree; "through the valley and beyond"; "to the eighth grade but not beyond"; "will be influential in the 1990s and beyond"
on the farther side from the observer; "a pond with a hayfield beyond"