Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula H₂. It is colorless, odorless, tasteless, non-toxic, and highly combustible. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter. Stars such as the Sun are mainly composed of hydrogen in the plasma state. Most of the hydrogen on Earth exists in molecular forms such as water and organic compounds. For the most common isotope of hydrogen each atom has one proton, one electron, and no neutrons. In the early universe, the formation of protons, the nuclei of hydrogen, occurred during the first second after the Big Bang. The emergence of neutral hydrogen atoms throughout the universe occurred about 370,000 years later during the recombination epoch, when the plasma had cooled enough for electrons to remain bound to protons.

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NASA Awards Contract for Liquid Hydrogen

Electrolysis of seawater to make hydrogen

Astronomers image the Sun in detail using hydrogen-alpha telescopes with monochrome cameras rather than colour as they can make full use of their sensors. This means processing software is used to make the Sun appear in colours like yellow and orange

Two novel hydrogen production catalysts based on mineral gel and 'crystalline-amorphous' dual-phase nano-aluminium alloy

World’s first test run of a hydrogen jet engine a success

Light-Powered Nanomaterial Catalyst Could Be Key for Hydrogen Economy

New catalyst could be key for hydrogen economy

‘Gold Hydrogen’ Is an Untapped Resource in Depleted Oil Wells

How the Hydrogen Revolution Can Help Save the Planet--And How It Can't

Oxygen Evolution Reaction Breakthrough for Efficient Hydrogen Generation

A Green Hydrogen Bet, GM Expects EV Profits By 2025 And The World’s Population Hits 8 Billion

Webb Space Telescope reveals birth of galaxies, how universe became transparent — UCLA astrophysicists shed light on how hydrogen fog burned away after the Big Bang

4.6 billion-year-old meteorite that crashed into Earth solves the mystery of water on our planet | "The ratio of hydrogen isotopes in meteorite's water resembles the composition of water on Earth."

Study touting hydrogen — a technology favored by gas firms — was funded by [undisclosed] gas interests, e-mails show

NASA Awards Contracts for Acquisition of Liquid Hydrogen

Clean hydrogen fuel is easier to produce from seawater with stable hierarchical electrocatalysts

New catalyst can turn smelly hydrogen sulfide into a cash cow

Hydrogen fueled Vehicles

Revolutionary technique to generate hydrogen more efficiently from water

Revolutionary technique to generate hydrogen more efficiently from water