Why are radio telescopes highly effective tools for mapping Supernova Remnants obscured by dust?

Answer

Radio waves can penetrate the obscuring dust that hides visible light from many SNRs.

Radio telescopes are very effective because radio waves possess the necessary wavelength characteristics to pass through the extensive clouds of interstellar dust that often obscure the optical light emitted by the remnant.

Why are radio telescopes highly effective tools for mapping Supernova Remnants obscured by dust?
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