NASA's James Webb Space Telescope has captured vivid new images of NGC 2392, the Lion Nebula, first catalogued by William Herschel in 1787. The nebula formed as its central star began shedding material roughly 10,000 years ago; that expelled gas and dust now creates the lion-like face and will disperse on a timescale of about 10,000 years. Webb's images reveal colorful outer shells and comet-shaped knots in the nebula's "mane," improving our view of how lower-mass stars die and seed the interstellar medium.
James Webb Reveals the Lion Nebula: Stunning New Details of a Dying Star
Lion Nebula roars into view as telescope captures dying star in breathtaking new detail
NASA's James Webb Space Telescope has delivered striking new images of NGC 2392, commonly known as the Lion Nebula, revealing fresh detail in the remains of a dying star.
First catalogued by William Herschel in 1787, the nebula began forming roughly 10,000 years ago when its central star started expelling material into space. A nebula is a vast cloud of gas and dust; many are created when lower-mass stars shed their outer layers rather than by the supernova explosions of the most massive stars.
"When a lower-mass star can no longer sustain itself with nuclear reactions in its core, the star becomes unstable and pulsates, losing its mass by shedding its outer layers, which then turn into shells of gas and dust called a planetary nebula," NASA explained.
Webb's images show the Lion Nebula glowing in vivid shades of purple, blue, pink and white across its outer shell, while the central region traces the face-like structure that gives the object its nickname. Within the nebula's "mane," observers can see hazy, comet-shaped knots of denser gas and dust—features that help astronomers study how the ejected material evolves and fragments.
As the dying star sheds material, radiation from the hot remnant pushes that ejected matter outward, carving an expanding bubble of ionized gas that produces the distinctive lion-face appearance. The exposed, extremely hot core left at the center will cool to become a white dwarf over time.
Scientists estimate that the nebula has been developing for around 10,000 years and will disperse on a timescale of roughly another 10,000 years—a relatively short interval on astronomical timescales. For context, a nearby and well-known planetary nebula is the Helix Nebula, located at about 700 light-years from Earth.
Webb's high-resolution infrared observations of NGC 2392 add valuable detail to our understanding of how lower-mass stars end their lives and how their expelled material enriches the interstellar medium. These images give astronomers clearer views of structure, composition and the dynamics of the nebula's knots and shells.
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