A Mars scientist shares the inside story of the NASA Curiosity rover's poignant first photo of Earth and Mars moon Phobos together in the twilight sky.

NASA’s Curiosity rover achieved a historic milestone by capturing the first-ever image of Earth alongside Phobos, one of Mars' moons, from the surface of the Red Planet. This remarkable image provides an extraordinary perspective of Earth as seen from another world,

It is the first time ever the two have been captured together from the surface of Mars. NASA's Curiosity Mars rover used its Mast Camera, or Mastcam, to capture the view of Earth setting while Phobos is rising.