- Hot dense matter, indeed: Scientists at the SLAC National Accelerator Laboratory have successfully super-heated a small piece of aluminum foil, as thin as spider silk, to a temperature of 3.6 million degrees Fahrenheit. They did this by hitting it with a rapidly pulsing, high-powered X-ray laser, which caused the foil to become what scientists refers to as “hot dense matter,” commonly found only in places like the center of stars. This is the first time a sample has been able to be reproduced in a lab setting, and could lead to greater understanding of nuclear fusion, among other things — the 3.6 million degree matter was, in fact, hotter than the corona of our Sun. (Photo from University of Oxford/Sam Vinko) source