Astronomy Cast

Episode 15: Listener Questions Answered


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We finally get organized enough deal with several listener questions: isn't dark matter just regular stuff we can't see? how can parts of the Universe be expanding faster than the speed of light? what will Betelgeuse look like when it explodes as a supernova? what's the speed of gravity? All these and more questions are answered.
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Astronomy CastBy Fraser Cain and Dr. Pamela Gay