The possibility that all that may be left of humanity is what we created (and what we destroyed) so the sense of a slow endless journey characterises the rhythm of the song. The final chord is really all the notes of an E minor scale; nothing is resolved it just drifts away.
The title suggests we really know very little about where we live and how amazingly fortunate we are to have a space to exist. And how we rather take it all for granted. For all we know we are not alone, but evidence for that seems not to stack up given the uniquely implausible set of circumstances that created life on Earth.
Catastrophic futures come to pass a mirrored planet held in glass.