NASA @NASA
Comets ☄️Cosmic balls of frozen gases, rock and dust that may well have delivered to the early Earth much of the water and carbon-based molecules (organics) that allowed life to form. Enjoy their trails as seen from the @Space_Station: https://t.co/rXa3spnU8O https://t.co/pFn1HKZjp8 — PolitiTweet.org