Definitions list
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magnetosphereRegion around a planet where a magnetic field is the chief factor governing the behaviour of charged particles.
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medium-Earth orbit (MEO)Orbit of an Earth satellite whose altitude at apogee is around 10,000 km, between low-Earth orbit and geostationary orbit.
What is an orbit?
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meteoriteFragment of an asteroid or comet, consisting of a variable-size chunk of stony or metallic matter, that can survive its passage through the atmosphere of a planet and strike the ground.
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microgravityGravity much lower than that experienced on Earth. The term zero gravity (used as a synonym for weightlessness) denotes a theoretical state that does not exist in practice. The term microgravity describes the real state of a spacecraft, which is always subjected to forces sustaining a residual gravity.
What is weightlessness?
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microgravitéGravité beaucoup plus faible que sur Terre. Ce mot est souvent employé abusivement à la place de micropesanteur, en tant que traduction maladroite du terme microgravity (en anglais, gravity signifie à la fois gravité et pesanteur)
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microsatelliteSatellite weighing a few tens of kilograms. Microsatellites are often designed to test technologies and auxiliary applications quickly and at low cost, alongside the main payload. Microsat in short.
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Milky WayIrregular luminous band of stars and gas clouds stretching across the sky. The Milky Way is the disk of the Galaxy seen from the inside, for example from the Solar System.
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minisatelliteSatellite weighing a few hundred kilograms. Minisat in short.
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MoonEarth’s natural satellite.
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multibandDenotes a viewing instrument or mode that operates in several spectral bands at the same time. Synonym: multispectral.