ケプラー1625b I
02712v1 [astro-ph.EP]。
↑ “Astronomers Find First Evidence of Possible Moon Outside Our Solar System”. NASA (2018年10月3日). 2018年10月5日閲覧。
↑ Drake, Nadia (2018年10月3日). “Weird giant may be the first known alien moon - Evidence is mounting that a world the size of Neptune could be orbiting a giant planet far, far away.”. National Geographic Society. https://www.nationalgeographic.com/science/2018/10/news-first-exomoon-nasa-kepler-planets-facts-space/ 2018年10月6日閲覧。
↑ “Hubble finds compelling evidence for a moon outside the Solar System - Neptune-sized moon orbits Jupiter-sized planet”. SpaceTelescope.org. 2018年10月6日閲覧。