Strange ‘sticky’ dark matter could be lurking in a distant galaxy

Galaxy SDSS J0946+1006 acts as a gravitational lens, helping astronomers see the signs of dark matter NASA/ESA/R. Gavazzi, T. Treu/University of California/SLACS An unusually dense galaxy could be the first clear evidence for the existence of an unconventional form of “sticky” dark matter, altering our understanding of this mysterious cosmic substance. In the standard picture…

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Scientists uncover why “stealth” volcanoes stay silent until eruption

When volcanoes are preparing to erupt, scientists rely on typical signs to warn people living nearby: deformation of the ground and earthquakes, caused by underground chambers filling up with magma and volcanic gas. But some volcanoes, called ‘stealthy’ volcanoes, don’t give obvious warning signs. Now scientists studying Veniaminof, Alaska, have developed a model which could…

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