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Puppis, constellation in the southern sky at about 8 hours right ascension and 30° south in declination. Its brightest star is Zeta Puppis, the nearest and brightest blue supergiant star, with a magnitude of 2.2. The largest known emission nebula, the Gum Nebula, is found here and in the neighbouring constellation Vela. This constellation was originally part of the much larger Argo Navis, which represented the ship Argo, in which Jason and the Argonauts sailed...