The Vela supernova remnant is a mere 800 light-years from Earth The map uses the so-called Aitoff ... Blues represent higher energy X-rays (1-2.3 kiloelectron volts, keV); greens are mid-range ...

DEMs are 3D graphics of the bare earth surface of land shown without trees, buildings or other objects. As for their application in building solar energy maps, these graphics consider elevation ...