46 responses on “IntrplnetSarah on Twitter: “Okay planetary friends and fans, time to get serious about #Inktober2019! Who’s in? @elakdawalla and I have come up with a planetary-themed prompt list, feel free to join us. #SpaceInktober #PlanetInktober https://t.co/bYjQ1Af6Vj” / Twitter”