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Secondaries
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Sulforaphane
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Hamiltonian
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Ecliptic coordinates of a direction
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Total eclipse
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Inflorescence
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M82
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Lagrangian point L2
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Bone densitometry
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The theory of punctuated equilibrium
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Hall effect
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Antiseptic
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Thrust
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Electron microscope
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Corsican pine
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Spectral colour
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Connex
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Outcrop
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Irreversible reaction
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Node
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Substrate
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Facies
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Hard disk
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Sea ice - Grey
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Grading
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Spermogenesis
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Dense Plume
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Alar bar
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Diarrhoea
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Cilia
Objective
An objective is the light-collecting part of a telescope.
The optical component of an observation instrument that is directed towards the object.
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