ScienceDaily: Stars News |
| Posted: 04 Dec 2014 06:11 AM PST For the first time, an international team of astronomers has revealed the dramatic 'blow out' phase of galactic evolution. The astronomers have discovered dense gas being blasted out of a compact galaxy (called SDSS J0905+57) at speeds of up to two million miles per hour. The gas is being driven to distances of tens of thousands of light years by the intense pressure exerted on it by the radiation of stars that are forming rapidly at the galaxy's center. This is having a major impact on the evolution of the galaxy. |
| Pulsars with black holes could hold the 'Holy Grail' of gravity Posted: 04 Dec 2014 04:41 AM PST The intermittent light emitted by pulsars, the most precise timekeepers in the universe, allows scientists to verify Einstein's theory of relativity, especially when these objects are paired up with another neutron star or white dwarf that interferes with their gravity. However, this theory could be analysed much more effectively if a pulsar with a black hole were found, except in two particular cases, according to researchers. Pulsars are very dense neutron stars that are the size of a city (their radius approaches ten kilometers), which, like lighthouses for the universe, emit gamma radiation beams or X-rays when they rotate up to hundreds of times per second. These characteristics make them ideal for testing the validity of the theory of general relativity, published by Einstein between 1915 and 1916. |
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