Even the faintest trace of hydrogen gas can spell trouble. In a chemical plant, it may auger a catastrophic industrial explosion; on a patient’s breath, it can signal various gastrointestinal ...

Ultraviolet (UV) light shining from these small galaxies may have powered an epoch known as the Era of Reionization, clearing the fog of hydrogen gas that permeated the universe in its first ...

A quiet, glowing gas cloud has been hiding in plain sight not far from Earth. For decades, astronomers have predicted that ...

Astronomers using the Green Bank Telescope spotted surprisingly cold, dense hydrogen clouds embedded inside the Milky Way’s ...

Greetings, stargazers. Emission nebulae are the subject of many of the most spectacular astrophotographs published in the last decade. Although there are many subcategories of nebulae, they all ...

Starlight from these galaxies would have been bright and energetic, with lots of it falling in the ultraviolet part of the spectrum. As this light flew out into the universe, it ran into more hydrogen ...

Ultraviolet light slips through a hole in a distant galaxy’s gas. Older galaxies might have used the trick to ionize most of the universe’s hydrogen.

The Orion Nebula has plenty of hydrogen gas, so when ultraviolet light heats up the surrounding hydrogen molecules, it creates a perfect condition for hydrocarbons to form.

The "cosmic dark ages" refers to a period during the early universe when sources of light were cloaked in a dense fog of neutral hydrogen gas. While light can now travel in all directions across ...

Instead of using highly-absorbing solid or liquid lenses, Schütte’s made their device from a jet of hydrogen gas that is fired across a beam of UV light. The density of the gas is varied in the ...