The sun is a blackbody radiator and does exactly what you think. However, RF from the sun basically only arrives at exactly one angle from the sky (or not at al

The sun is a blackbody radiator and does exactly what you think. However, RF from the sun basically only arrives at exactly one angle from the sky (or not at all, if it is night time). It does exactly what you describe, degrading SNR from signals in the same direction to the point of uselessness. If you've ever used satellite based services like television then you've probably experienced it. There is a long explanation here: https://www.abc.net.au/news/science/2017-03-20/how-can-the-sun-mess-with-your-tv-and-radio/8363976 https://www.abc.net.au/news/science/2017-03-20/how-can-the-s... > The period in which the Sun passes behind a geostationary satellite is brief — about 10 minutes at most according to Dr Carter — but the noise is enough to degrade or completely disrupt radio and television broadcasts, as well as satellite internet.