Scientists have demonstrated a new optical security element that not only combines microprints with invisible inks, but also makes them colorful.
Updated: 05/13/2019 09:07A
Non-thermal X-rays result mostly from synchrotron emission, while gamma-rays may come from so-called synchro-curvature emission - a combination of the two mechanisms. It is relatively easy to find pulsars that radiate gamma-rays - NASAs Fermi ...
Updated: 11/24/2018 07:54P