If you are interested in general discussion please visit one of the threads elsewhere on reddit that are more appropriate for that, such as in /r/Cosmos here and in /r/Space here. Popular science shows, books, and news articles are a great way to causally learn about your universe, but they often contain a lot of simplifications and approximations, so don't assume that because you've heard an answer before that it is the right one. The usual AskScience rules still apply in this thread! Anyone can ask a question, but please do not provide answers unless you are a scientist in a relevant field.
Click here for more viewing information in your country. The show is airing in the US and Canada on Fox at Sunday 9pm ET, and Monday at 10pm ET on National Geographic. This week is the fifth episode, "Hiding in the Light". If so, please take a look at last week's thread instead. If you are outside of the US or Canada, you may only now be seeing the fourth episode aired on television. Welcome to AskScience! This thread is for asking and answering questions about the science in Cosmos: A Spacetime Odyssey. We make our world significant by the courage of our questions and by the depth of our answers.
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