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Artist's concept of what a VLEO satellite might look like using the air-breathing electric propulsion technology being developed in the Otter program.
Artist's concept of what a VLEO satellite might look like using the air-breathing electric propulsion technology being developed in the Otter program. | Download Source: DARPA

Otter

This program will develop, demonstrate, and collect on-orbit data for "air-breathing" electric propulsion technologies that enable operations in very low earth orbit (VLEO) – altitudes of 90 - 450 kilometers.

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