Tag: #jameswebb

James Webb Finds Uranus’s Major Moons Carry Comet-like Water Signature

JWST finds Uranus’s five regular moons have comet-like deuterium-to-hydrogen ratios in their water ice, challenging models that mix large amounts of Uranian material.

#uranus, #jameswebb, #planetaryscience, #moons

Study: Webb observes z=10.255 galaxy that may leak nearly all ionizing radiation

A Webb study finds a compact z=10.255 galaxy with almost no nebular lines, implying a very high Lyman-continuum escape fraction and possible impact on reionization.

#astronomy, #jameswebb, #reionization, #highredshift

Webb detects unusual isotopes in interstellar comet 3I/ATLAS, suggesting formation in an ancient cold environment

JWST spectra of interstellar comet 3I/ATLAS show very high deuterium and uncommon carbon ratios, pointing to formation in a cold, ancient, metal-poor region.

#interstellar, #comet, #jameswebb, #isotopes

Webb Captures Rapid Atmospheric Heating on Eccentric Giant Exoplanet HD 80606 b

Webb's MIRI tracked HD 80606 b heating by about 1,100°F at periastron, revealing rapid temperature and chemical changes; preliminary results shown at AAS.

#exoplanet, #jameswebb, #astronomy, #hd80606b

Webb Measures Massive Black Hole in Tiny Galaxy 700 Million Years After Big Bang

Webb's NIRSpec mapped gas in a z=7.04 'Little Red Dot', finding a 10^7–10^8 solar-mass black hole that may outweigh its primitive host.

#astronomy, #blackhole, #jameswebb, #cosmology, #earlyuniverse