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Hamiltonian
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Biodiversity
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Mutagen
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H1 histamine antagonist antitussive
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Abyssal plain
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Intrusion
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Cyclosilicates
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Black body
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Hypernova
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Satellite image
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Arend-Roland comet
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Ardipithecus
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Renewable energy
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Western Palearctic ecozone
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Retrotransposon
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Hale-Bopp comet
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Buddleja davidii
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Filtration
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Mars Odyssey
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CSA
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IAM
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Empress tree
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Hour circle of a direction
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Calcium antagonist
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Taq polymerase
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Philopatry
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Cache poisoning
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Sour cherry
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Euthanasia
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Kebira crater
Parsec
A parsec is the distance at which a star must be to have a parallax of 1 second of arc. (In fact there are no stars as close as that). 1 parsec = 3.2616 light-years.
Credit: Rennes Astronomy Society
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