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Links and Show Notes Blue Origin conducts first hot-fire test of BE-4 engine - SpaceFlight Insider Blue Origin just sent a jolt through the aerospace industry | Ars Technica Bigelow Aerospace wants to put an inflatable space habitat in orbit around the Moon - The Verge NASA Jet Propulsion Laboratory Blog | Planet Nine The Search for Planet Nine: Theory The Search for Planet Nine: Planet Nine: where are you? (part 1) Gravitational waves have let us see huge neutron stars colliding | New Scientist NASA Missions Catch First Light from a Gravitational-Wave Event | NASA