world rank. 1639. Overview. Founded in 1970, Universidade Estadual de Londrina (State University of Londrina) is a non-profit public higher education institution located in the the urban setting of the small city of Londrina (population range of 250,000-499,999 inhabitants), Parana.
Scientists have hotly debated whether the bursts are cosmological -- from the edge of the universe -- or galactic, from within the Milky Way. Now we have strong evidence that most gamma ray bursts come from within our galaxy, Lamb said. The 25-year-old question about where the bursts originate may finally be answered.. Lamb said the evidence that the bursts are galactic in origin was a surprise, and certainly not something I was confident of initially..
Gamma ray photons tend to be produced during nuclear decays, which can release a lot more energy than electronic transitions. (You can also get gamma ray-photons from some other high-energy processes, like lightning. See the wikipedia page for for more.) In general, photons can come from a huge variety of sources. Photons are just an excitation of electric and magnetic fields, so all you need is a process to provide energy and a means of converting another form of energy into light. Here are some examples.