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Gliese 570 Gliese 504 bTài liệu tham khảo
WikiPedia: Gliese_570 http://www.solstation.com/stars/gl570abc.htm http://www.space.com/scienceastronomy/astronomy/br... http://ad.usno.navy.mil/wds/orb6.html https://web.archive.org/web/20090412084731/http://...