Das Fahrrad ist längst mehr als ein reines Fortbewegungsmittel. In den letzten Jahren entwickelte es sich zu einem gefragten Lifestyle-Produkt und neuen Statussymbol einer jungen Generation. Der Wirtschaftswissenschaftler Philipp Wegerer untersucht die Folgen des Trends zum Rad unter anderem in Tirol. (more…)
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How do you grow a supermassive black hole that is a million to a billion times the mass of our sun? Astronomers do not know the answer, but a new study using data from NASA’s Wide-field Infrared Survey Explorer, or WISE, has turned up what might be the cosmic seeds from which a black hole will sprout. The results are helping scientists piece together the evolution of supermassive black holes — powerful objects that dominate the hearts of all galaxies.
Growing a black hole is not as easy as planting a seed in soil and adding water. The massive objects are dense collections of matter that are literally bottomless pits; anything that falls in will never come out. They come in a range of sizes. The smallest, only a few times greater in mass than our sun, form from exploding stars. The biggest of these dark beasts, billions of times the mass of our sun, grow together with their host galaxies over time, deep in the interiors. But how this process works is an ongoing mystery. (more…)