Last Updated: Exoplanet Osiris Revealed To Have Six Secrets Unveiling A Bigger Mystery Exoplanet Osiris is discovered to have six different chemicals hovering around its atmosphere suggesting that its origin is far bigger than previously expected. Exoplanet Osiris (Image Source: Exoplanet Exploration NASA) Osiris, officially called HD 209458 b, discovered in 1999 is popularly known for being the first-ever planet outside of our solar system that astronomers spotted. Today, a little more information regarding the exoplanet has been brought to our attention. As reported in the latest study published in Nature by the researchers at the University of Warwick, Osiris is said to have six different chemicals hovering around its atmosphere. It's the first time that so many different chemicals have been discovered on one single exoplanet, which uncovers a bigger mystery tied to its origin.