Launching today is America’s classified NROL-44 spy satellite, which German public broadcaster DW calls “a massive, open secret”: NROL-44 is a huge signals intelligence, or SIGINT, satellite, says David Baker, a former NASA scientist who worked on Apollo and Shuttle missions, has written numerous books, including U.S. Spy Satellites and is editor of SpaceFlight magazine. “SIGINT satellites are the core of…