Including the non-governmental organisation of experts committed to expanding the frontiers of space, what were the other two societies Loeb was elected fellow of?
International Academy of Astronautics The International Academy of Astronautics (IAA) is a non-governmental organisation of experts committed to expanding the frontiers of space. It was established in Stockholm (Sweden) on August 16, 1960.
British Interplanetary Society The British Interplanetary Society (BIS), founded in Liverpool in 1933 by Philip E. Cleator, is the oldest space advocacy organisation in the world. Its aim is exclusively to support and promote astronautics and space exploration.