An unusual object detected streaking across the sky last month was a comet that originated outside our solar system, observations have confirmed, becoming only the second observed interstellar object to cross into our solar system.
원문출처 : https://www.cnn.com/2019/09/24/world/second-interstellar-visitor-confirmed-scn-trnd/index.html
원문출처 : https://www.cnn.com/2019/09/24/world/second-interstellar-visitor-confirmed-scn-trnd/index.html