On Point with Meghna Chakrabarti The hidden chemistry at the heart of the Milky Way
May 12, 2026
Adam Ginsburg, an astrochemist and University of Florida astronomer, and Steve Longmore, a Liverpool John Moores astrophysicist who leads the ALMA Galactic Center survey. They unpack ALMA’s huge, color-coded Milky Way mosaic. They describe swirling molecular filaments, how specific molecules act like fingerprints, mysterious ultra-broad-line objects, and what the center’s conditions reveal about star formation and galaxy centers.
AI Snips
Chapters
Transcript
Episode notes
ALMA's Mosaic Reveals Molecular Map Of The Galactic Center
- ALMA made the largest, most detailed radio mosaic of the Milky Way center, revealing unprecedented structures and chemistry.
- The image maps molecular fingerprints (e.g., CO, methanol) as colors so morphology plus chemistry reveal physical conditions across scales.
The Thrill Of Stitching 45 Submosaics Together
- Adam Ginsburg described painstakingly assembling 45 sub-mosaics before seeing the full image for the first time.
- He felt thrilling satisfaction when the individual specks of data combined into one beautiful, high-fidelity mosaic.
Millimeter Waves Let Us Watch Star Birth In Motion
- Millimeter/submillimeter wavelengths probe the cold interstellar medium that becomes new stars and planets.
- ALMA measures molecular lines and Doppler shifts to track gas velocities, collapse, and star-formation dynamics 25,000 light years away.