HEOS definitions

Heos

1) High earth orbiting satellite
Found on https://www.crosswordclues.com/clue/heos

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HEOS

(Highly Eccentric Orbiting Satellite) HEOS 1 ESRO (European Space Research Organisation) satellites that traveled in extremely elongated orbits in order to study the interplanetary magnetic field and solar and cosmic ray particles outside Earth`s magnetosphere. Nine sc...
Found on http://www.daviddarling.info/encyclopedia/H/HEOS.html

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HEOS

High Earth Orbiting Satellite
Found on http://www.encyclo.co.uk/visitor-contributions.php

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