May 17, 2021 06:28 PM EDT IN SPACE - JANUARY 14: The planet Mercury is shown from a distance of approximately 17,000 miles, taken by NASA's Messenger spacecraft January 14, 2008 at the spacecraft's closest approach to planet. The image shows features as small as six miles in width. Similar to previously mapped portions of Mercury, this hemisphere appears heavily cratered. On the upper right is the giant Caloris basin, including its western portions never before seen by spacecraft. Formed by the impact of a large asteroid or comet, Caloris is one of the largest, and perhaps one of the youngest basins in the solar system. (Photo : Photo by NASA via Getty Images)