NASA on Instagram: "It was a rocky visit ☄ This runaway point of light pictured by the @NASAHubble Space Telescope is the Comet Borisov, named after amateur astronomer Gennady Borisov who first observed it in 2019. It’s the first confirmed comet to enter our solar system from some unknown place beyond our Sun’s influence. Comets are snowballs of ice, dust and frozen gas. Their frozen nucleus can be about the size of a small town, but when heated by the Sun their tails can extend for millions of