How do radio telescopes study galaxies that are hidden by dust?
Quick Answer
They detect radio waves, which pass through dust much better than visible light. That lets astronomers map gas clouds, star formation, and galactic structure hidden from optical telescopes.
The Full Story
Dust can block visible light from the centers and spiral arms of galaxies, but radio waves can travel through it. Radio telescopes detect emissions from hydrogen gas, molecules in star-forming regions, and energetic sources such as pulsars and black holes. This makes radio astronomy essential for studying the Milky Way’s hidden structure and distant galaxies. Instruments like the Very Large Array and ALMA have transformed the field.
Key Facts
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"How do you see through cosmic dust?"
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