text: The HESS project is a series of telescopes which detect cosmic gamma rays via this phenomenon.
full_question: The HESS project is a series of telescopes which detect cosmic gamma rays via this phenomenon. Since this effect is emitted in a cone, detection of "rings" formed by it can determine the angle of emission. Super-Kamiokande ["kah-mee-oh-KAN-day"] uses this effect to detect neutrinos. The amount of this phenomenon for a given wavelength is predicted by the Frank-Tamm formula, whose developers won the Nobel in physics in 1958 along with this effect's namesake. For 10 points, name this bluish radiation that occurs when a charged particle exceeds light's velocity in its medium which creates the bluish glow seen in nuclear reactors.
first_sentence: The HESS project is a series of telescopes which detect cosmic gamma rays via this phenomenon.
raw_answer: Cherenkov radiation