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JWST Discovers Surprising UV Emissions from Protostars

12/2/2025

Summary

JWST Discovers Protostar Radiation

James Webb Space Telescope (JWST) observations detect unexpected high-energy ultraviolet radiation around five protostars in the Ophiuchus molecular cloud, ~450 light-years away.
The finding challenges current star-formation models by showing protostars emit radiation.
The team, led by Iason Skretas of the Max Planck Institute, investigates whether the UV emission is internal or external.
Initial analysis indicates the radiation is internal.
Researchers will continue studying the Ophiuchus region.

Summary

JWST Unveils Nebulae

NASA's James Webb Space Telescope captured detailed images of the Red Spider Nebula, revealing lobes about 3 light-years long traced by H2 emission.
JWST also observed the protoplanetary disk IRAS 04302+2247, located 525 light-years away and encircling a young protostar, a disk larger than our solar system that obscures the protostar and reveals surrounding reflection nebulae, which earns the Butterfly Star nickname.
These findings clarify stellar formation and nebular structures.

History

Historical Context

The Rho Ophiuchi cloud complex, identified in 1995, is one of the closest star-forming regions, located about 460 light-years from Earth. It contains approximately 3,000 solar masses of material, with L1688 being the most active star-forming area. Recent observations from the James Webb Space Telescope reveal unexpected high-energy ultraviolet radiation from protostars, challenging existing star formation models and advancing our understanding of stellar evolution.

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JWST Discovers Protostar Radiation

James Webb Space Telescope (JWST) observations detect unexpected high-energy ultraviolet radiation around five protostars in the Ophiuchus molecular cloud, ~450 light-years away.
The finding challenges current star-formation models by showing protostars emit radiation.
The team, led by Iason Skretas of the Max Planck Institute, investigates whether the UV emission is internal or external.
Initial analysis indicates the radiation is internal.
Researchers will continue studying the Ophiuchus region.

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