Labels:bulletin board | encyclical | fence | pier | pole | reckoner | sea | sidewalk | sky | skyscraper | water OCR: based -optical telescop rgely planet presents a brigh vent featureless face Before ever unmanned space fli adio astrononers knowing waves can penetrate T gnals cloud cover, bounced off the planet. inferring features from the retur signals This technique rface tantalizing glimpses but took spacecraft li llan Venus Pioneer and the dar expeditions to provide imaging necessar to detailed false color om planet like that seen Magellan data) portraved here telescor Befor astrononmers ignals bouncec inferin tures retu tanta lizing alirnpses butit itions ging datal borraved
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