Infrared Stars

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Science  11 Aug 1967:
Vol. 157, Issue 3789, pp. 635-638
DOI: 10.1126/science.157.3789.635


Our searches for very cool stars have revealed three kinds of objects: very cool Mira stars, perhaps cooler than any of this type previously known; extremely dense interstellar clouds, more dense than any known heretofore; and, probably, cool circumstellar clouds that may be planetary systems in an early stage of formation.