events
Lexell's Comet is seen closer to the Earth than any other comet in recorded history, approaching to a distance of 0.0146 astronomical units (2,180,000 km; 1,360,000 mi).
Related Wikipedia articles
Lexell's Comet
Closest observed comet approach to Earth
D/1770 L1, popularly known as Lexell's Comet after its orbit computer Anders Johan Lexell, was a comet discovered by astronomer Charles Messier in June 1770. It is notable for having passed closer to Earth than any other comet in recorded history, approaching to a distance of…Source: Wikipedia (CC BY-SA)
Astronomical unit
Mean distance between Earth and the Sun
The astronomical unit is a unit of length defined to be exactly equal to 149597870700 m. Historically, the astronomical unit was conceived as the average Earth-Sun distance, before its modern redefinition in 2012.Source: Wikipedia (CC BY-SA)