Radio telescopes may help reveal history of our universe

An international team of scientists led by researchers at Tel Aviv University has developed a method for detecting galaxies of stars that formed when the universe was in its infancy, during the first 180 million years of its existence.
The method is able to observe stars that were previously believed too old to find, said Prof. Rennan Barkana of TAU’s School of Physics and Astronomy.
The researchers’ method uses radio telescopes to seek out radio waves emitted by hydrogen atoms, which were abundant in the early days of the universe. Emitting waves measuring about eight inches (21 centimeters) long, the atoms reflect the radiation of the stars, making their emission detectable by radio telescopes, explained Prof. Barkana. This development opens the way to learning more about the universe’s oldest galaxies.

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