Carl Sagan in a Cornell University laboratory

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Aatif Sulleyman

By Aatif Sulleyman

Freelance Reporter

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Carl Sagan, the beloved American astronomer, philosopher and educator, continues to shed light, 25 years after his death on December 20, 1996, on the state of society, politics, and our species' place in the universe.

An intellectual titan, Sagan also had an inimitable talent for making extraordinary concepts accessible to ordinary people and using everyday analogies to explain lofty insights, making all who read his words or heard his voice feel simultaneously invaluable and absurdly insignificant.

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In a tribute to her late husband, scientist Ann Druyan said "the rest of us still struggle to catch up with him" a quarter of a century after his death, and that his ideas and concerns have become "more influential" over time.

He was passionately and repeatedly voicing his concerns over the state of the environment decades before it gained any mainstream traction, and he was also a firm advocate for equality, open dialogue, and curiosity.

In an effort to celebrate his life and his wisdom, Twitter users are sharing some of Sagan's most insightful and inspiring quotes online.

Carl Sagan in a Cornell University laboratory

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