Astronomers from the University of Cambridge, UK, have found for the first time the true outer limits of a galaxy. They have also shown that the dark matter in this galaxy is not distributed in the way conventional theory predicts.
The team - Professor Gerry Gilmore, Dr Mark Wilkinson, Dr Jan Kleyna and Dr Wyn Evans - presents its results today at the 25th General Assembly of the International Astronomical Union in Sydney, Australia. The work could provide the key to understanding how larger galaxies were formed, including our own Milky Way galaxy.
The researchers studied rare "dwarf spheroidal" galaxies. These have few visible stars but contain massive amounts of "dark matter" - a mysterious kind of matter that does not emit its own light or radiation, and therefore cannot be directly observed by astronomers. However, dark matter can be detected by the gravitational pull it exerts on visible objects such as stars.
Professor Gerry Gilmore | EurekAlert!
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Among the general public, solar thermal energy is currently associated with dark blue, rectangular collectors on building roofs. Technologies are needed for aesthetically high quality architecture which offer the architect more room for manoeuvre when it comes to low- and plus-energy buildings. With the “ArKol” project, researchers at Fraunhofer ISE together with partners are currently developing two façade collectors for solar thermal energy generation, which permit a high degree of design flexibility: a strip collector for opaque façade sections and a solar thermal blind for transparent sections. The current state of the two developments will be presented at the BAU 2017 trade fair.
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