Whether you are a student of astrophysics, a policy wonk worried about orbital debris, or simply a human who has looked up and wondered, Aswin Sekhar is a name you need to know. He reminds us that astronomy is not a luxury—it is a planetary defense system, a cultural heritage, and a source of humility all rolled into one.
His advice to young astrophiles is typical of his no-nonsense yet hopeful style: "Do not wait for a perfect dark sky. Go out now with binoculars. Learn orbital mechanics on a napkin. And never stop asking who owns the stars." In an era of billionaires racing to space and AI scanning for alien technosignatures, Aswin Sekhar represents the conscience of astronomy. He is not the loudest voice, nor the most prestigious chair-holder, but he is one of the most integrated thinkers. He connects the Tunguska blast of 1908 to the Starlink launch of 2024. He links the search for Venusian microbes to the protection of Himalayan observatories. aswin sekhar
In a series of rigorous papers, Aswin Sekhar brought modern computational fluid dynamics and orbital back-integration to bear on the century-old mystery. His work suggested that the Tunguska impactor was likely a low-density, fragile asteroid (a "rubble pile") rather than a comet. More importantly, he modeled how such objects fragment in Earth’s atmosphere—models that now inform planetary defense strategies. Whether you are a student of astrophysics, a
Sekhar has coined the term "orbital light pollution" to describe the cumulative effect of satellite trails on professional observatories. His unique contribution is linking this to . He asks: If we cannot see the Milky Way from Earth because of artificial satellites, how will future generations develop a cosmic perspective? How will we detect faint, potentially biogenic signals from exoplanets if our instruments are saturated by reflections from LEO debris? Go out now with binoculars
He is not anti-technology; rather, he advocates for binding international treaties on satellite reflectivity, maximum numbers per orbital shell, and mandatory deorbiting timelines. "The night sky is a global commons," Sekhar states frequently, "like the high seas or the Antarctic. No corporation should own the view of the stars." In 2020, the world was electrified by the announcement of phosphine gas in the clouds of Venus—a potential biosignature. Aswin Sekhar entered the fray not as a direct discoverer, but as a critical synthesizer. He co-authored papers examining non-biological sources for phosphine (such as volcanic activity or lightning) and challenged the astronomical community to adopt stricter standards for "biogenic claims."
He is also consulting for the United Nations Office for Outer Space Affairs (UNOOSA) on a proposed "Dark and Quiet Skies" resolution.