Tugna:Orbitals acetylene.jpguploaded to the English language Wikipedia in July 2007. Source http://en.wikipedia.org/wiki/Image:Orbitals_acetylene.jpg Author en:User:ProkopHapala
Tugna:Methaneplanet.jpgESO/Serge Brunier: https://commons.wikimedia.org/wiki/File:ESO_-_Milky_Way.jpg Suggestions for improving this image are welcome: pablocarlosbudassi@gmail