Can anyone recommend me a user friendly software for Astronomy purposes. I am looking forward to create simulations of Galaxies, Brown dwarfs, White Dwarfs, asteroids and some other celestial objects which are mostly dimmer and lie in a certain part of EM Spectrum (infrared). It would be best if I say that I am willing to create simulations of those objects which a mission called WISE (Wide-field Infrared Survay Explorer) is looking for. and please send me the link through which I can download it too. Sometime it is hard to figure out that from where I can download the actual software.