NASA @NASA
💧 ☄️ Our Neil Gehrels Swift Observatory tracked water loss on comet Borisov as it neared the Sun. The comet is only the 2nd known interstellar visitor, meaning it came from outside the solar system: https://t.co/1ynngWqHu6 https://t.co/5T2UWzV14k — PolitiTweet.org