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" ... 100 billion years from now, the nearest galaxy will be unobservably distant; no optical or even infrared telescope in existence today would be able to see a single galaxy beyond our own. Without that clue to guide a civilization, how would they ever know to search for an ultra-faint, leftover glow? How would they ever surmise that our Universe arose from a hot, dense, uniform, rapidly expanding past? It may be the case that the only reason we determined our cosmic origins is because we came into existence so early in the Universe’s history. The signals will change and become harder to detect, sure, but even though they won’t quite disappear, future civilizations won’t have the same clues that we do. In a way, we really are the cosmically fortunate ones. ... "
" ... Any mass that orbits any other mass will emit it, with the smaller mass typically experiencing the largest effects. For example, we think of Earth being in a stable orbit around the Sun, but that’s not quite technically true. If the Sun were to keep its properties constant — no changes in mass, ever — the Earth would not remain in an elliptical orbit forever. Rather, the planets would slowly radiate energy away, their orbits would decay, and they would eventually spiral into the Sun. It might take Earth some ~1026 years to succumb to this fate, an unobservably long time, but if gravitational radiation is real, this decay will occur. ... "