How do radio telescopes see parts of the universe that optical telescopes cannot?
Quick Answer
They detect radio waves emitted by cold gas, pulsars, galaxies, and other sources that may be invisible in normal light. Radio waves also pass through dust that blocks visible light.
The Full Story
Radio telescopes observe the universe at wavelengths much longer than visible light, revealing structures and objects that optical telescopes can miss. Cold hydrogen gas, pulsars, molecular clouds, and the cores of distant galaxies can all emit strongly in radio. Because radio waves are less affected by interstellar dust, they can probe regions hidden from visible-light astronomy. Large facilities such as the Very Large Array and the Square Kilometre Array project have become essential tools for modern astronomy.
Key Facts
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"The invisible universe that radio telescopes uncover."
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