@LouisIngenthron @coreyspowell

Radio telescopes need to be huge, and radio waves are harder to block than infrared. The sun also emits radio waves but I don't know how much of a problem it is.

Physician here, not physicist. All know about this I read in the link provided in the OP and this YouTube video by astrophysicist Matt O'Dowd

youtu.be/9F3WRMlZEy4