The company's Block 1 BlueBird satellites undergoing thermal vacuum testing in preparation for launch.AST SpaceMobileSatellite-to-phones service provider AST SpaceMobile stock surged after announcing a partnership with Verizon on Wednesday, adding to the company's recent deal with AT&T to provide remote coverage across the United States.AST SpaceMobile is building satellites to provide broadband service to unmodified smartphones, in the nascent "direct-to-device" communications market.The compan...