When Voyager reached the edge of our solar system back in 1990 and turned it's improbable eye back four billion miles to whence it came - that occasion triggered a philosophical speech from Carl Sagan that has since become the equivalent of a religious tract for agnostics.
The universe is vast and empty, we (the earth) are just a pale blue speck, smaller than a single pixel on the screens of those looking at themselves back at the Kennedy Space Centre. That the earth is stage for every human action whether good or ill - and that apparently no-one is coming to help and we must grow up and save the planet and love one another... and so on - read it here if you likey.