Question

Astronomers study radio waves to learn about the universe. Why might radio waves be used to study objects in space?

They are sound waves that cause vibrations in stars and planets.

They are electromagnetic waves, so they don't require a medium.

They are mechanical waves that pass through interstellar particles.

They are longitudinal waves, which create compressions in the fabric of space.
Radio waves can penetrate dust and gas clouds, allowing astronomers to observe objects that are otherwise obscured.

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