In this free topic I would like to show you my favorite constellation. Of the 88 constellations in the sky my favorite one is “Crux” called also “Southern Cross” in English o “Cruz del Sur” in Spanish. I love the apparent simplicity of this one, because many of the others constellations in the sky are composed of multiple stars and the polluted atmosphere of Santiago de Chile makes difficult to appreciate all their complexity. In the other hand “Crux” is always visible at night. His name comes from the fact that this constellation its always pointing with one of his most brilliant stars to the south. This was helpful for travelers and sailors in the time when Europe expands his frontiers to the new world, America. “ α Crux ”, the star we see pointing south, it’s a system of orbiting stars -Just imagine suns orbiting around suns! So beautiful! The anatomy of Crux its quite simple if we just focus on his four main stars -non amateur observation considers nineteen stars, but if we tak