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Roger Penrose, “The Cyclic Universe” (Open Agenda, 2021)

New Books in Science, Technology, and Society

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Dark Matter and Dark Energy - What Is It All About?

People are talking about dark matter and dark energy. So why? Why are they talking about that? What is that all about? Welh these. First of all, let's start with dark matter, because that was the one that was first e discovered. If you like, am our galaxy is held together by gravity. It's ting, and you can work out how much matter there should be there for the amount of rotation. People started to get very puzzled by the fact that there didn't seem to be enough mass in the stars to account for holding the galaxy together when there's this much motion. Thestarted in the 60 sir ver ribbon wassissin a se,. i

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