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(astronomy, obsolete) a nebula that appears white in colouration through a high-powered telescope (nebulae often appear to have some hint of colour through a powerful telescope, but white when not using a powerful instrument); these nebulae were generally to be determined to be galaxies in the 20th century

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white nebula

The astronomer excitedly recorded the spectrum of the white nebula through the observatory's new telescope.

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The astronomer excitedly recorded the spectrum of the white nebula through the observatory's new telescope.

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