Hydrogen is the element that you can find the most in the universe because it makes up almost 90% of the entire universe. It is colorless, odorless and can explode if you light it on fire. Hydrogen can escape from the atmosphere because it is very light, unless it is combined with something because it has a proton and an electron. Hydrogen can be mixed with all other elements in the periodic table except the non-metals of Group VIIIA. There are different forms of ortho and para hydrogen that are different because their electrons and nuclei spin in different directions. (It's elementary) Hydrogen is used or otherwise introduced into the proton-proton and carbon-nitrogen cycle. Liquid hydrogen is used in cryogenics by spraying it onto a target and causing it to freeze, it is also used in superconductivity research. It can also be used in fixing during the Haber ammonia process, and it is used in welding or hydrogenation of fats and oils during methanol manufacturing. They make rocket fuel, fill balloons, produce hydrochloric acid, and make fewer metal ores. Hydrogen is mainly found ...