The NASA/ESA/CSA James Webb Space Telescope lately imaged NGC 2392 (aka. the Lion Nebula), so-named due to its distinctive look, which resembles a lion’s face seen head-on. The venerable Hubble Space Telescope (HST) additionally considered this nebula in 2000, showcasing its inhabitants of hazy, comet-shaped objects. By combining information from its Close to-Infrared (NIRI) and Mid-Infrared (MIRI) devices, Webb has supplied the clearest, most detailed view but of the Lion Nebula.
The picture reveals the nebula’s complicated construction and the white dwarf at its heart that continues to form it. This stellar remnant created the nebula when it reached the top of its life cycle and shed its outer layers. This star appears just like the nostril of the lion, whereas the prolonged gaseous envelope and shells of mud and tendrils resemble the lion’s “mane.” The central star is so sizzling that it illuminates every part contained in the bubble, ionizing hydrogen because it does and inflicting it to develop and destroy a lot of the mud it encounters.
Whereas extra huge stars endure collapse on the finish of their lives and shed their outer layers in an explosive occasion (a supernova), lower-mass stars like NGC 2392 are completely different. When these stars exhaust their hydrogen and helium gasoline, they change into unstable and start to pulsate, blowing off their outer layers within the course of. The highly effective radiation from the stellar remnant drives the ejected materials away, abandoning a white dwarf surrounded by a shell of gasoline and mud. That is how a lot of the observable mud within the Universe is produced.
Within the case of the Lion Nebula, the progenitor star was oxygen-rich, abandoning a white dwarf that heats every part contained in the bubble and ionizes the hydrogen gasoline. The gasoline bubble is increasing, clearing a lot of the mud in its path and creating the complicated construction of rings and shells seen within the picture. Understanding these buildings, frequent in planetary nebulae, stays an energetic space of astronomical analysis.
Whereas Webb’s photographs seem much like Hubble’s optical photographs at first look, Webb’s infrared devices highlighted sure options. These embody compact clumps of mud that seem purple, orange, and yellow within the picture, in addition to haze brought on by ionized gasoline. These clumps are people who survived the increasing gasoline cloud, that are additionally defending materials that lies past them. The highly effective forces that trigger the nebula to seem this manner are ongoing and can proceed to change its form as its gasoline and mud migrate away from the stellar core.
Astronomers estimate that the lionesque look of this nebula will disperse in about 10,000 years.
