International Asteroid Day, observed worldwide every June 30, aims to raise awareness about asteroids and the potential dangers they pose to Earth. The date commemorates the anniversary of the 1908 Tunguska event, the largest recorded impact event in Earth's history. The initiative was launched by Brian May, Grigorij Richters, Danica Remy, and Rusty Schweickart, and was officially endorsed by the United Nations General Assembly in December 2016. The first celebration took place in 2015, following the premiere of a film about a fictional asteroid impact, which May and Richters collaborated on. Notable supporters of Asteroid Day include NASA astronauts, scientists, and artists, with backing from institutions like the Science Museum in London and the European Space Agency. Activities on this day often include educational events and discussions focused on planetary defense and the significance of asteroids in our solar system.