the scary thing is that somehow they have the money to send you flyers in the mail.
i wonder if the discovery of intelligent life out there will cause this group to implode - if the earth is no longer center stage but rather has to share the stage with Tau Ceti VI... then poof!

as for gravity - there could be alternative theories for that. like that every mass is ballooning up in volume at every moment.. (scott adams highlighted this theory in the Dilbert Future)