How Many Sigma?

by Dr. Tahir Yaqoob February 6, 2012

Quite often, a scientific conclusion has to be assigned a probability of being true, and this is often expressed in jargon as a certain number of “sigma.” We will need to refer to this terminology often, so the purpose of this article is to explain what the jargon means. First of all, there is an […]

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Exoplanet Mass-Orbital-Period Distribution Conflicts with Planet Formation Theory

by Dr. Tahir Yaqoob January 31, 2012

The current theory of planet formation, known as the “core accretion theory” is increasingly running into direct conflicts with observations. This was only a question of time because it is based on a physical impossibility: nobody has figured out a way to grow planetesimals from tiny dust grains in the nascent disk because gravity does […]

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The Nature Paper on the First Confirmed Earth-sized Exoplanets Kepler-20e and Kepler-20f

by Dr. Tahir Yaqoob January 19, 2012

Towards the end of 2011 there was a frenzy of reporting in the online and offline media about the discovery by the Kepler mission of the first two Earth-sized exoplanets, Kepler-20e and Kepler-20f, orbiting a sunlike star. These exoplanets were known before from the Kepler data, but had just been promoted from “candidate” to “confirmed” […]

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