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longstanding-problem-of-star-formation-solved-generation-of-star-forming-molecular-clouds-by-parker-instability Molecular clouds are the birthplaces of stars in galaxies. Those clouds are extremely cold (about minus 260 degree Celsius). Therefore, the low internal thermal pressure allows the condensation of stars out of these clouds due to their own gravitational weight. Molecular clouds are also permeated by the galactic magnetic field. Similar to the thermal pressure, magnetic fields act as counterforce against gravity, which in principle could hinder the formation of stars. Given the fact that the galactic magnetic field is fairly strong (about 6 micro Gauss), the question remained how star-forming clouds could build up within galaxies. In a recent study, researchers from the Hamburger Sternwarte and the McMaster University in Hamilton, Canada,...