an object like Nemesis could exist. NASA Ask An Astrobiologist. August 2, 2011 [2011-10-22]. （原始内容存档于2012年12月13日）. David Morrison. this hypothetical Nemesis

奥尔特云

Institute. 2011 [2011-08-11]. （原始内容存档于2012-03-04）. Can WISE Find the Hypothetical 'Tyche'?. NASA/JPL. 2011-02-18 [2011-06-15]. （原始内容存档于2012-03-04）. John

第九行星

2016）. Beust, H. Orbital Clustering of Distant Kuiper Belt Objects by Hypothetical Planet 9. Secular or Resonant?. Astronomy & Astrophysics. 2016, 590:

Found in articles

行星類型列表

涅墨西斯星

an object like Nemesis could exist. NASA Ask An Astrobiologist. August 2, 2011 [2011-10-22]. （原始内容存档于2012年12月13日）. David Morrison. this hypothetical Nemesis

奥尔特云

Institute. 2011 [2011-08-11]. （原始内容存档于2012-03-04）. Can WISE Find the Hypothetical 'Tyche'?. NASA/JPL. 2011-02-18 [2011-06-15]. （原始内容存档于2012-03-04）. John

第九行星

2016）. Beust, H. Orbital Clustering of Distant Kuiper Belt Objects by Hypothetical Planet 9. Secular or Resonant?. Astronomy & Astrophysics. 2016, 590: