How much is a Second Class stamp? best website to get someone to write a paper for you I guess it would depend on what time they looked and which asteroid they were lucky enough to catch. But we know of water-rich asteroids in the outer main belt and I think there would be a good chance that they would see a signature of something like the asteroid Ceres. And in that case, if the alien astronomers speculated about habitable planets - well, if they're looking back at our system, in that case they'd be correct. 必須 2000文字以内 [bbs:youtube:(Youtubeの動画ID)]と書くとYoutubeの動画が貼れます。(例:[bbs:youtube:OQThUAQ0UN0])