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2I/Borisov - The Interstellar Comet

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Sagittarius B2

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The Galactic Golden Ratio

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Trigonometric parallax

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Strange Matter

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The Lorentz Factor

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Hubble's Constant

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Shapley Supercluster

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Rainbows

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Boötes Void

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White Dwarfs (Sirius B)

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The energy of electromagnetic waves

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Perihelion and Aphelion

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Triple Conjunction (and a meteor?)

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Jupiter - Saturn (Great) Conjunction - 2020

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Orion Nebula

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