An accountancy practice <a href=" http://www.blogdojorgearagao.com.br/tag/tre/ ">confronto viagra e cialis</a> Comet ISON was originally discovered by a pair of Russian astronomers, and was named after the ISON (International Scientific Optical Network) telescope. The comet is believed to have originated from the vastness of the Oort Cloud, harboring billions of icy planetesimals at the edge of our Solar System.