How to Navigate a Spacecraft from Far, Far Away | OSIRIS-REx + New Horizons

How does someone on Earth fly a spacecraft that's billions of miles away? Science, math, planning and some good old fashioned NASA-know-how.

On Dec. 3, 2018, NASA's OSIRIS-REx mission will arrive at Asteroid Bennu where it will spend two years surveying this relic from our early solar system before ultimately collecting a sample and returning it to Earth. Keep up with OSIRIS-REx at: https://www.nasa.gov/osiris-rex

On New Year's Day 2019, NASA's New Horizons mission will visit Ultima Thule, making this Kuiper Belt object the most distant object ever explored by humankind. Keep up with New Horizons at: https://www.nasa.gov/mission_pages/newhorizons/main/index.html