The Mature Bar: How a Galaxy 7.6 Billion Years Ago Outpaced the Universe ✦
Original: "Bar-driven secular evolution largely complete in a disk galaxy 7.6 billion years ago"
JWST discovered a completely formed X-shaped bulge in galaxy UDS 12999, pointing to an early completion of bar-induced evolution.
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JWST peered 7.6 billion years back and spotted a galaxy with an already mature X-shaped bulge—as if the cosmic potter worked in fast-forward. Such structures usually take eons, but here it’s a rapid dash. Textbooks will need a rewrite: galaxies grow up far earlier than we thought.
🎯 Our own Milky Way also has an X-shaped bulge, discovered by the infrared telescope WISE; its formation likely wrapped up around 8 billion years ago.
v = H_0 d
Relativistic Hubble's law, linking recession velocity and cosmological distance; from the measured redshift z=0.923, it yields the light travel time (~7.6 billion years) and the age of the Universe at the observation epoch (6.2 billion years).
Scientists
Christian DopplerD. B. McLaughlinDidier QuelozMichel MayorR. A. RossiterAlbert Einsteingalactic evolution
galaxy
star formation
JWST
spectroscopy
photometry
redshift
numerical simulation
stellar evolution
cosmic dustLaws
Doppler effectgravitational lensingMaxwell's equationsPlanck's lawPlanck–Einstein relationWien's displacement law