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nebula
(astronomy) A cloud in outer space consisting of gas or dust (e.g. a cloud formed after a star explodes). / (archaic, medicine) A white spot or slight opacity of the cornea.
nebulas
nebulae
protoplanetary nebula
(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.
preplanetary nebula
(astronomy) A stage in stellar evolution when a star starts to shed its outer layers before coming a true planetary nebula.
radio nebula
(astronomy) Any nebula that emits radio waves
white nebula
(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
spiral nebula
(astronomy) a spiral-shaped nebula / (astronomy, obsolete) a spiral-shaped white nebula; these were generally determined to be spiral galaxies in the 20th century
planetary nebulae
plural of planetary nebula
planetary nebulas
plural of planetary nebula