Researchers from Cardiff University, MIT and Cambridge University have suggested the terrestrial planet, which is 29.42 million miles from Earth and often described as Earth's" sister" or" twin" due to its rocky composition, could have the colourless gas made up of nitrogen and hydrogen that is also known as ammonia in its clouds.... The scientists have modelled a set of chemical processes to show how a cascade of chemical reactions would neutralise surrounding droplets of sulfuric acid if ther