All Known Asteroids in the Solar System (1999-2018) 24/07/2018 This animation represents a map of the increased count of all known asteroids in the solar system between Jan. 1, 1999, and Jan. 31, 2018. Blue represents near-Earth asteroids. Orange represents main-belt asteroids between the orbits of Mars and Jupiter. For more info about how NASA tracks and studies asteroids and comets: https://www.jpl.nasa.gov/asteroidwatch/ and https://cneos.jpl.nasa.gov/ . | Astronomy Nation