Alaknanda Unveiled: Indian Astronomers Spot Milky Way Twin from Cosmic Dawn

Discovery Details

Alaknanda, named after the Himalayan river feeding the Ganga, spans 30,000 light-years with about 10 billion solar masses and clear "grand design" spiral arms visible via gravitational lensing from Abell 2744 cluster. JWST's infrared imaging across 21 filters revealed its stellar mass, dust, and star-formation rate, showing surprising maturity when the universe was only 10% its current age.​

This find, published in Astronomy & Astrophysics, suggests complex structures emerged far earlier than models predicted, prompting reevaluation of galaxy evolution.​

Key Highlights

Ancient Timeline: Light traveled 12 billion years; galaxy active at redshift z~10, just 1.5 billion years post-Big Bang.​

Milky Way Mirror: Symmetric spirals, "beads-on-a-string" star clusters; one-third Milky Way size but fully formed disk.​

Tech Edge: JWST UNCOVER/MegaScience surveys amplified by lensing; GALFIT analysis confirmed structure.​

Future Probes: ALMA/JWST spectroscopy to check disk dynamics—cold gas inflows or mergers?​

Sources: India Today, Firstpost, Deccan Herald, BBC