Tuesday marks International Asteroid Day.
Near-Earth objects (NEOs), such as asteroids or comets, represent potentially catastrophic threats to our planet.
16,000 near-Earth asteroids have been discovered.
The Earth's largest recorded asteroid impact, the Tunguska asteroid event, took place on 30 June 1908 in Siberia, Russian Federation.
In 2016 the United Nations declared 30 June International Asteroid Day to observe the anniversary of the Tunguska impact and to raise public awareness about asteroid impact hazard.
The Day also aims to inform the public of contingency actions in case of a credible NEO threat.
(Photo credit: ESA | Pierre Carril).