== Physical characteristics ==
Whitmire and Jackson have suggested that Nemesis would have a mass varying from 2 * 10<sup>-4−4</sup> to 7 * 10<sup>-2−2</sup> times the mass of the sun. This is the range of masses of brown or black dwarf stars. Muller has argued that the star is a somewhat hotter red dwarf, of magnitude between 7 and 12.<ref name=Muller/>
== Controversy ==
== Search for Nemesis ==
As mentioned, no one has yet seen Nemesis. A recent infrared survey of the sky failed to detect it.<ref name=Schlyter/> But at least two more wide-ranging surveys of the sky are planned, by the Panoramic Survey Telescope and Rapid Response System (Pan-Starrs)<ref name=PanStarrs>"[http://pan-starrs.ifa.hawaii.edu/public/ Pan-Starrs Home]."</ref> and the Large Synoptic Survey Telescope (LSST)<ref name=Muller/><ref name=LSST>"[http://www.lsst.org/lsst_home.shtml LSST Home]."</ref><ref name=Muller/>
== References ==
{{reflist|2}}
== Related Link ==
* Muller, Richard A. "[httphttps://www.youtube.com/watch?v=ERy-MTfgulc Physics 10 - Lecture 25: Universe II]" Department of Physics, [[University of California]], [[Berkeley]], [[California]], delivered May 4, 2006. Mentions Nemesis ''inter alia''.
== See also ==