The Quanta Podcast Uniting a Century of Digital and Analog Astronomy
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Mar 24, 2026 Liz Kruesi, science writer who links historical astronomy with modern surveys, explores how century-old glass plate photos are being reunited with Rubin Observatory data. She discusses connecting vintage and digital records to extend time baselines. Conversations cover changing celestial objects, plate-making and archives, and the hands-on work of digitizing and mining these photographic collections.
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Rubin Observatory Multiplies Time Domain Power
- Modern time-domain surveys like the Rubin Observatory amplify a century of transient astronomy by adding depth, cadence, and automated alerts.
- Rubin tiles the visible sky every three days with a car-sized camera, producing billions of alerts over 10 years.
Cepheid Variables Built the Cosmic Distance Ladder
- Variable stars like Cepheids link brightness cycles to intrinsic luminosity, creating a distance-measuring rung.
- Henrietta Leavitt discovered the period-luminosity relation on glass plates in 1912, enabling Hubble to identify other galaxies.
The Physical Scale Of Glass Plate Archives
- Glass plates were large physical records, commonly 8x10 inches and up to 14x17 inches used by Tombaugh.
- The largest known plate is 40x40 inches at Yerkes showing a 1901 solar eclipse, now broken but preserved.