Asteroid Day Jun 30, 2025

Asteroid Day

Each scar on Earth from a meteorite impact tells a story—from the asteroid that wiped out the dinosaurs to the lesser-known craters that dot the planet. Asteroid Day highlights ongoing research into asteroids and the potential threats they pose. Started in 2015 and backed by the United Nations, this day marks the anniversary of the Tunguska event—a massive explosion that occurred in Siberia on June 30, 1908. This explosion flattened over 800 square miles of Siberian forest near the Tunguska River. The blast released energy equal to 10–15 megatons of TNT, a standard measure of explosive force. Since then, craters like Arizona"s Barringer, Quebec"s Manicouagan, and others have helped scientists study what happens when space rocks hit Earth.

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Today in History

Jun 30, 2018The aftermath of a meteorite
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Jun 30, 2021An impactful day
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Jun 30, 2023Brown bears in Lake Clark National Park and Preserve, Alaska
Jun 30, 2024Ubud, Bali, Indonesia

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