The original post: /r/askscience by /u/Guillaume_Taillefer on 2024-11-07 00:18:21.

Hello, I was genuinely curious about this because it seems a little confusing to me. One problem in militaries using radar, specifically Air-to-Air defenses and aircraft, is that things like the ground, trees, mountains, and clouds or adverse weather can interfere with the radar, so they have to try to filter it out.

Meanwhile Radio Telescopes used for astronomy seem to not have a problem working under bad weather and even rain.

Is it a difference between frequencies of how the two are used or is there some other at play here?