New Horizons closing in on a half-billion miles since 2006…so an average speed of around 3,800 miles per hour.

In a new blog, SwRI’s @AlanStern writes about an incredible new milestone for the New Horizons mission. The spacecraft will soon reach a distance from Earth of 50 AU — that’s 50 times the distance of the Sun to the Earth! Read more.https://t.co/fqIUK15E7Y pic.twitter.com/i1b0tgUumg

— Southwest Research Institute (@SwRI) March 24, 2021