[OC] South pole seen from outer space by NASA [1920x980] http://ift.tt/2jrSNGL
Ring of Fire.. The northern lights, as photographed by NASA, from space.
Types of Advanced Civilizations According to the Kardashev Scale
PHD Comics: Gravitational Waves Explained Simple explanation but really interesting for further understanding on gravitational waves. "That's one small step for man, one giant leap for mankind" Neil Armstrong quote
How to Make a Solar Inverter Circuit | Electronic Circuit Projects