Today I learn so many new things, I learn a lot about Gamma Ray thanks to Dieter Hartmann, we Skype with him and he was a great man. I learn that Gamma Ray can't pass to Earth because when Gamma ray reaches our atmosphere it absorbs it, so now I know that it's not possible to touch us. But Gamma Ray can kill living cells. They're produce by the hottest regions of the universe, also by supernova explosions. Photoelectric absorption when an incoming gamma ray transfers all of its energy to an atomic electron.

Today we also explore Galaxy Zoo it is a very fun website, plus we are helping astronomers classifying galaxies which is really helpful for them because this way they can get rid of galaxies that are useless. Although I have fun looking at galaxies I got stuck in this weird image, can anybody help me? 



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