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In the early days of ISS, when they were building it with the shuttle, there was a soccer ball sized robot camera called AER Cam Sprint. NASA, public domain. Astronaut for scale They tested it successfully out of the shuttle bay. It had stereo cameras, a light, and cold nitrogen thrusters. It was not autonomous, but was controlled by an astronaut inside. ...


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One of the docking systems in use on the ISS is a passive APAS-95 system. Tiangong-2 is believed to also have a passive APAS-95 system or something mechanically compatible. In order for two APAS-95 adapters to connect, at least one of them needs to be an active adapter, so Tiangong-2 can't dock with the ISS, but a Shenzhou spacecraft could probably dock ...


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@RussellBorogove's comment is fairly conclusive. ...I note that Celestrak was established in 1985, at which point Salyut 7 was up, but Skylab was not. The Archived TLE data page says 1980-2004, but there's a link to request earlier data. Skylab reentered the atmosphere before 1980 and Tiangong-1 and Tiangong-2 were both launched after 2004. And, as ...


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