Hydrogen peroxide is thought to form in space on the surfaces of cosmic dust grains — very fine particles similar to sand and soot — when hydrogen (H) is added to oxygen molecules (O[sub]2[/sub]). A further reaction of the hydrogen peroxide with more hydrogen is one way to produce water (H[sub]2[/sub]O). This new detection of hydrogen peroxide will therefore help astronomers better understand the formation of water in the Universe.
We knew from laboratory experiments which wavelengths to look for, but the amount of hydrogen peroxide in the cloud is just one molecule for every ten billion hydrogen molecules, so the detection required very careful observations
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