BOOMERanG experiment

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The BOOMERanG experiment (balloon observations of millimetric extragalactic radiation and geophysics) was an experiment that flew a telescope on a (high-altitude) balloon and measured the cosmic microwave background radiation of a part of the sky during three sub-orbital flights.

Excerpt from the Wikipedia article “BOOMERanG experiment”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Auteur inconnu, Public domain, via Wikimedia Commons.