The Japan Aerospace Exploration Agency's Hayabusa2 spacecraft fired a copper cannonball a little bigger than a tennis ball into a near-Earth asteroid named Ryugu to learn about its composition.
원문출처 : https://www.cnn.com/2020/03/19/world/ryugu-asteroid-hayabusa2-scn/index.html
원문출처 : https://www.cnn.com/2020/03/19/world/ryugu-asteroid-hayabusa2-scn/index.html