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“They have figured out the aerosphere they live in,” Dr. Gill said.

“The whole notion of the aerosphere and airspace as habitat is not something that has come into the collective psyche until recently,” Farnsworth says.

One of these is in Angle's Airplane Engine Encyclopedia, published in 1921, and the other is in Aerosphere 1939, published in 1940.

"So the whole concept of aeroecology is an integrated approach using many different tools to try to answer the questions about how organisms move and use the aerosphere."

British expert G. Geoffrey Smith, whose authoritative work, Gas Turbines and, Jet Propulsion for Aircraft, will soon be published in the U.S. by Aerosphere, Inc., makes this distinction: a rocket carries its own combustion mixture, including oxygen; a jet-propulsion device has fuel but draws oxygen for combustion from the surrounding atmosphere.