File talk:EM Spectrum3-new.jpg

Can anyone explain to me how it is possible to detect the Cosmic Microwave Backgroundon the Earth's surface if--according to this chart--microwaves do not penetrate the atmosphere? — 以上未簽名的留言是由該使用者加入的： Jonathan144 (留言 • 貢獻) 16:45, 28 January 2019 (UTC)