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abberration (of starlight):
Apparent displacement in the direction of a star due to the earth's orbital motion.
ablation:
Fragmentation and vaporization of a meteorite upon entering the atmosphere.
absolute magnitude:
Apparent magnitude a star would have at a distance of 10pc.
absolute zero:
A temperature of -273°C (or 0 K), where all molecular motion stops.
absorption spectrum:
Dark lines superimposed on a continuous spectrum.
accelerate:
To change velocity; either to speed up, slow down, or change direction.
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