Hydrogen is ubiquitous in the atomosphere, in the earth and in all living things. It readily forms compounds with other elements such as oxygen (water), carbon (methane), nitrogen (ammonia) and many others. Because elemental hydrogen is very reactive, specifically with oxygen, it is often used in rocket engines which require a tremendous amount of thrust. Hydrogen is a clean source of energy and doesn't contribute to pollution or greenhouse gases. This is why many scientists and automobile manufacturers are looking for ways to build safe, reliable vehicles which use hydrogen instead of petrol as fuel.
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A visualisation showing the structure containing Hydrogen alongside other structures published in the same scientific article: