Definitions list
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heat shieldDevice designed to protect part of a spacecraft from heating, particularly when entering a gaseous atmosphere at high speed. It is made of insulating or ablative material.
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Heliocentric (Sun-centred) theoryTheory that places the Sun at the centre of the “world”. It was originally expounded by the Greeks in the 3rd century and taken up later by Copernicus in the 16th century, after which it slowly gained acceptance.
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highly inclined orbit
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hydrazineColourless, toxic and corrosive liquid with physical properties similar to water. Certain hydrazine compounds are used as fuel.
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hydrosphereLayer of water at or near the Earth's surface that includes all liquid and frozen surface waters.
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hypergravityGravity greater than that experienced on Earth.
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hyperpesanteurPesanteur supérieure à celle de la Terre.