On top of the world. ⁣ ⁣ On Dec. 2, NASA astronaut Andrew Morgan snapped a photo of the the Earth 250 miles (~400 km) below him. He was embarking on the third spacewalk to upgrade the Alpha Magnetic Spectrometer’s (AMS) thermal pump system.⁣ ⁣ The AMS is designed to measure antimatter in cosmic rays, which helps us search for evidence of dark matter. ⁣ ⁣ Image Credit: NASA/Andrew Morgan (astrodrewmorgan)⁣ ⁣ #NASA #Views #OnTopOfTheWorld