Spectrum and Blackbody Radiation

I re-listened to lecture three about spectrum and blackbody radiation. As I understand it a blackbody absorbs light- like a black surface is hotter than a white surface heated by the Sun. If you took the atmosphere away from the Sun it would be a perfect black body- this was where I got confused: why is something that radiates light a black body? Well maybe if we looked at the hot back surface heated by the Sun in infrared wavelengths we would see that it was radiating- as I’m writing this I think I just now understand why the sun would be a perfect black body without its atmosphere now! Okay this leads us to where we get into absorption lines- the Sun’s atmosphere has gasses whose electrons absorb energetic photons at certain wavelengths which create a dark line on the absorption spectrum. And we can use these dark lines to find what elements are present in a star.