By subscribing to a specific mailing list, you will get answers to your questions. The list is restricted to discussions of issues related to becoming an astronaut. A mailing list for the discussion of issues relating to the use of CCD systems in professional astronomy.
Information concerning satellite launches and orbital elements is posted regularly.
Questions are particularly encouraged. A mailing list and Web archive dedicated to saving the deep-sky observations of amateur astronomers, with the widest possible range of experience, instrumentation, and conditions. The Royal Greenwich Observatory Worldwide Guide to Astronomical Email Addresses. Discussions about political, economic, and policy aspects of spaceflight. Planetary science, space-based astronomy, and other space science.