Radio telescopes reveal invisible cosmic gas
Radio telescopes map invisible hydrogen gas, revealing the universe's structure, the birthplace of stars, and offering clues to galaxy formation since the Big Bang.
Radio telescopes are cosmic detectives, mapping hydrogen gas across the universe. This gas, invisible to regular telescopes, emits faint radio waves at a specific 21-centimeter wavelength. Scientists use this signal to peer into vast clouds of interstellar and intergalactic hydrogen, which makes up about 75 percent of the universe's normal matter.
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