Researchers have uncovered one of Uranus’ secrets, NASA announced. Researchers had long wondered about the reason behind cloud formation in the planet located 2.9 billion kilometers away from the sun, according to NASA. NASA said in a press release that "even after decades of observations and a visit by NASAs Voyager 2 spacecraft, Uranus held on to one critical secret — the composition of its clouds," the German News Agency reported. NASA said that researchers have now verified one of the key components of the planet’s clouds. It is the hydrogen sulfide, a foul-smelling gas that most people avoid (it smells like rotten eggs). A global research team reached this conclusion after it has spectroscopically dissected the infrared light from Uranus captured by the Gemini North telescope in Hawai. Scientists had long suspected the existence of hydrogen sulfide gas, but they were unable to identify it positively. Looking for worlds beyond our solar system is still ongoing after NASA decided to resume space research. Scientists hope this will expand their known catalog of the so-called “exoplanets” that might be capable of harboring life, Reuters reported. NASA’s latest astrophysics-based mission aims to build on the work of the Kepler space telescope, which discovered the bulk of some 3,500 exoplanets, as part of a mission documented during the past 20 years/ this mission has been considered an evolution in astronomy. NASA expects the Transit Exoplanet Survey Satellite-TESS, to pinpoint thousands more previously unknown worlds, perhaps hundreds of them Earth-sized or “super-Earth” sized - no larger than twice as big as our home planet. Those are believed the most likely to feature rocky surfaces or oceans and are thus considered the best candidates for life to evolve, unlike the huge gas-formed Neptune and Jupiter. Astronauts hope to end up looking for 10 to 30 exoplanets so they can hold further studies.