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Just watched this full transit video from SDO: http://venustransit.gsfc.nasa.gov/data/kiosk/dataset/Venus_AIA12s_304Track/phase/track Oddly enough, if you look carefully, you can see the surface features of the sun through Venus' disk! Anyone know why this might be? I have a couple of ideas, neither of which I am confident about: 1) The CCD picking up the image is retaining some energy from earlier images, causing a ghost on the CCD. My main problem with this idea is that there is a good amount of time (over a minute and a half) between images, so presumably, any ghost heat on the CCD should have dissipated? Aside from this, I have no idea whether residual heat on the CCD would cause such an image. 2) Radiation from the sun at certain wavelengths is passing through Venus? As I write this, I realise how silly it is - any form of radiation (neutrinos only really) that could pass through an entire planet, would also presumably pass straight through our CCD. So apart from that I have no idea. I'm certain it's something fairly mundane, but interesting nonetheless! Any thoughts?