== 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 ==
However, even uniformitarian geologists do not necessarily accept the claimed periodicity of ELEs.<ref name=Britt/><ref name=Mukai/>
=== Re-examination ===
On 2 July 2010, Mellot and Barnbach published a study suggesting that the ELEs have occurred over 500 million years, during which galactic tides and encounters with passing stars should have perturbed the orbit of the hypothetical Nemesis, but did not. Therefore, they now say, such a star cannot be blamed for ELEs occurring regularly ever 26 million years.<ref name=Mellot>Mellot A and Barnbach RK, "Nemesis reconsidered", ''Solar and Stellar Astrophysics'', 2 July 2010. Accesssed 12 July 2010. {{arXiv|1007.0437v1}}</ref>
== A creationist perspective ==
== 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 ==