Mapping Humanity From Space: NASA’s Black Marble with Dr. Miguel Román

How can a weather satellite see Ramadan, Christmas and a blackout? Dr. Miguel Román joins Krishna Choudhary to explain NASA's Black Marble: nightly maps of the lights on Earth, from a single band on the VIIRS instrument, processed to account for moonlight, airglow, clouds and atmospheric effects. It began as a calibration job on a brand-new satellite and an "anomaly" that followed the lunar calendar. Román traces how a small NASA team turned it into open data now used for energy access, disaster response and urban growth: Puerto Rico before and after Hurricane Maria, why LEDs can make satellite maps look darker, the 30-meter Black Marble HD, and a John Deere tractor seen from space. Recorded in Washington, D.C., on September 28, 2026, before the Golden Goose Awards ceremony. Román is Deputy Director for Atmospheres and Data Systems at NASA Goddard Space Flight Center and a member of the Black Marble team, recognized with a 2026 Golden Goose Award. Part of our Golden Goose series. CHAPTERS 00:00 Cold open: three moments from the interview 00:49 A NASA intern's question and a new weather satellite 02:38 Calibrating the night band: the Moon and the desert 04:09 The anomaly: Ramadan seen from space 05:39 Christmas lights, and home in Puerto Rico 06:48 A new pair of glasses: all of humanity at night 08:32 From calibration to a Black Marble team 11:51 Opening the data to the world 12:58 Keeping the data honest: moonlight and airglow 14:36 One band, and why LEDs look like dimming 15:57 Why the satellite can't see blue: one instrument, many jobs 18:20 Light from every angle, and building heights 22:14 Puerto Rico: the 2016 blackout and Hurricane Maria 27:29 A Golden Goose story: Adjuntas, La Perla and resilience 30:21 From 500 m to 30 m: Black Marble HD 34:55 Ground truth, and a tractor seen from space 36:50 Electrifying Africa: the darkest places on Earth 40:58 What the Golden Goose Award means 44:49 Thank you, and why showing the method matters 47:46 Outro RESEARCH & FURTHER READING Holidays in lights: Ramadan and Christmas (2015): https://doi.org/10.1002/2014EF000285 NASA's Black Marble product suite (2018): https://doi.org/10.1016/j.rse.2018.03.017 Puerto Rico after Hurricane Maria (2019): https://doi.org/10.1371/journal.pone.0218883 Uncertainty and viewing angle in night lights (2021): https://doi.org/10.1016/j.rse.2021.112557 Multiangle night-light composites (2022): https://doi.org/10.1109/LGRS.2022.3176616 Volatility in human night-time activity, Nature (2026): https://doi.org/10.1038/s41586-026-10260-w NASA Black Marble data: https://www.earthdata.nasa.gov/data/projects/black-marble Tracking SDG7: The Energy Progress Report 2025: https://www.worldbank.org/en/topic/energy/publication/tracking-sdg-7-the-energy-progress-report-2025 EDITORIAL NOTES 15:12: White LED streetlights often use blue emitters near 450 nm, outside the VIIRS day-night band's roughly 500-900 nm sensitivity. A change in lighting technology can change what the satellite detects. 22:50: NASA dates the island-wide outage to late on September 21, 2016, following a power-plant fire; nearly 1.5 million customers lost power. 30:21: The 30-meter Black Marble HD maps are downscaled using additional land-surface information, not native 30-meter night-light measurements. Miguel explains this distinction later in the section. 36:50: About 666 million people lacked electricity in 2023, including 565 million in sub-Saharan Africa (Tracking SDG7 2025). Statements reflect the September 2026 recording. WATCH & LISTEN Episode notes and research: https://ffppod.com/episodes/ep67 Golden Goose science rundown (EP59): https://ffppod.com/episodes/ep59 Watch and listen: https://ffppod.com Subscribe: https://www.youtube.com/@FromFirstPrinciplesPod?sub_confirmation=1 Support the show: https://ffppod.com/donate Follow @FFPPod on Instagram, TikTok, X and Facebook. Breaking down science news so it makes sense to curious people everywhere. #BlackMarble #GoldenGooseAward #SciencePodcast