A symbol of the cold war era but we have to let it go just like we watched the car that got us through college towed away to the auto graveyard. Sentimentality is okay... up to a point. Also we have yet to find intelligent life right here, let alone up there.
It is (for me) sentimentality. I have a more sanguine view of humanity, but...even for myself, I wonder more often than I should about intelligent life on this planet.