See how many asteroids and comets have come close to Earth in the past 20 years.
원문출처 : https://www.cnn.com/videos/us/2018/07/25/rise-in-near-earth-asteroids-orig-mz.cnn
원문출처 : https://www.cnn.com/videos/us/2018/07/25/rise-in-near-earth-asteroids-orig-mz.cnn