An Inverted Nemesis

An Ongoing Nemesis

M liability and its effect on the practice of obstetrics and gynecology is one of the most important issues that face the specialty and each practitioner today. As a result, the American College of Obstetricians and Gynecologists (the College) has worked hard to achieve reform, especially at the national level. On five separate occasions during the 110th Congress (2007–2008), the College facili...

Nemesis Reconsidered

The hypothesis of a companion object (Nemesis) orbiting the Sun was motivated by the claim of a terrestrial extinction periodicity, thought to be mediated by comet showers. The orbit of a distant companion to the Sun is expected to be perturbed by the Galactic tidal field and encounters with passing stars, which will induce variation in the period. We examine the evidence for the previously pro...

Medical nemesis?

Nemesis of neglected neurosarcoidosis

Neurosarcoidosis (NS) is diagnosed when noncaseating granulomas develop in the nervous system, often associated with similar pathology in other organs. While lung and skin manifestation are more common, the neurological manifestations including meningitis, parenchymal brain or spinal cord lesions, or cranial or peripheral nerve damage are among the most serious and difficult to treat manifestat...

Mass limit on Nemesis

We assume that if the sun has a companion, it has a period of 27 Myr corresponding to the periodicity seen in cometary impacts on earth. Based on this assumption, it is seen that the inner Lagrengian point of the interaction between the Sun and its companion is in the Oort cloud. From this we calculate the mass – distance relation for the companion. We then compute the expected apparent magnitu...