CG 4 in Puppis: The Globule and The Galaxy

CG 4 in Puppis: The Globule and The Galaxy

Is this a cosmic monster ready to devour an unsuspecting galaxy?

Thankfully, that is not the case. The red “monster” shown in the featured image is cometary globule CG 4, 1,300 light-years away in the constellation Puppis. CG 4 is a molecular cloud, where hydrogen becomes cold enough to form molecules that can be brought together by gravity to create stars. The shape of CG 4 resembles that of a comet, but its head is 1.5 light-year in diameter and its tail is 8 light-years long; for comparison, the distance from the Earth to the sun is only 8 light-minutes.

Astronomers think that the tail of a cometary globule could have been shaped by a nearby supernova explosion or by irradiation from hot, massive stars. Indeed, CG 4 and other nearby globules point away from the Vela Supernova Remnant, at the center of the Gum Nebula. The edge-on spiral galaxy, ESO 257-19, is more than a hundred million light-years beyond CG 4, and is completely safe from the “monster”.

Image Credit & Copyright: William Vrbasso
William's website: https://www.stellaraustralis.com
Text: Cecilia Chirenti (NASA GSFC, UMCP, CRESST II)
Release Date: March 11, 2026

#NASA #Astronomy #Space #Science #Galaxies #SpiralGalaxy #ESO25719 #Nebulae #MolecularCloud #CometaryGlobuleCG4 #CG4 #PuppisConstellation #MilkyWayGalaxy #Universe #Astrophotography #WilliamVrbasso #Astrophotographer #GSFC #STEM #Education #APoD