The loudest? In his new book Extreme Cosmos (Perigee, 2012), astronomer Bryan Gaensler reveals the cosmic record holders of these and many other titles. In an excerpt below, from the chapter Extremes of Temperature, Gaensler explains the physics behind some of the hottest stars known:
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Molecular Response is defined as a negative PCR or other negative molecular test. Molecular responses can only be measured using a Polymerase Chain Reaction/PCR test. A PCR test is defined as a very sensitive test which can be used to detect the presence of very low levels of specific genetic material (DNA) .