re: The vanishing sky (a cry against light pollution)
Another way, aliens might see the sky, is if they had moon of water ice at L-2
Space/Science » in reply to re: The vanishing sky (a cry against light pollution)
Space/Science » in reply to re: The vanishing sky (a cry against light pollution)
Another way, aliens might see the sky, is if they had moon of water ice at L-2