艾达与艾卫: 小行星和它的卫星
2023年5月28日 Ida and Dactyl: Asteroid and Moon Image Credit: NASA, JPL, Galileo Mission Explanation: This asteroid has a moon. The robot spacecraft Galileo on route to Jupiter in 1993 encountered and photographed two asteroids during its long interplanetary voyage. The second minor planet it photographed, 243 Ida, was unexpectedly discovered to have a moon. Th...