Ok this has gone on long enough, I'm a nuclear engineer, so radiation is one of my areas of expertise, the transparency of the atmosphere wouldn't have damn thing to do with the attenuation of electromagnetic radiation, or any type of radiation for that matter, they only thing that affects em radiation is the density of the matter it is passing through and the energy of the radiation, gamma has the highest energy so it has the most penetrating power and it goes down from there, Tom get an education before posting again because u r hurting hour fellow FEers more than u r helping them, you are stupid tom, sorry but it's true, henry light is also crap, light does not bend, If u know how em radiation works than u know what I'm talking about, it is impossible for light to "bend" light appears to bend when it passes objects of extreme mass, this is because space-time is bent and therefore light is simply following the shape of space-time. If you want to propose henry light again you will provide an explanation of how the light is bent(I'm sure I'll get a good laugh out of it). You FEers are the ones defending your theory here so that means the burden of proof is on you, why don't you act like it? By the way dark energy does not interact with regular matter which is why if is called dark energy, it is only speculated to exist because it cannnot be measured because it does not interact with regular matter.