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There are two ways to start a story about the axion. One is to explain that this hypothetical particle could be the key to a major problem in the Standard Model of particle physics, which describes all of the known fundamental particles. The beauty of the axion is that there is a second, equally significant beginning to its story. We now suspect the axion may also be the answer to one of the most important questions if not the most important question in all of particle physics and astronomy: What is dark matter? Dark matter is the term that researchers use for the invisible substance that seems to dominate the formation of cosmic structure and to make up the majority of all tangible matter in the universe. The first thing I like to tell people about dark matter, to help them develop some intuition for this strange idea, is that dark matter is a terrible name for this stuff, whatever it is. The term is often attributed to Swiss astrophysicist Fritz Zwicky, who proposed the ....
There s so much more that s on its way, including our second podcast coming next week, an upcoming holiday giveaway for the lucky submissions chosen for Ask Ethan, and some more spectacular articles about how the Universe came to be, and how we know it. (Oh, and we ve also almost unlocked the next Patreon reward, for real! Let s make it happen before 2015 is out!) Now, join me as we jump in to our Comments of the Week! From Dean on the UFO seen from the ISS: As I explain, however, this is simply light reflecting off of the ISS’s HDEV module, nothing more complex or extraordinary than that. ....
Credit: GBO / AUI / NSF In the 1970s, physicists uncovered a problem with the Standard Model of particle physics the theory that describes three of the four fundamental forces of nature (electromagnetic, weak, and strong interactions; the fourth is gravity). They found that, while the theory predicts that a symmetry between particles and forces in our Universe and a mirror version should be broken, the experiments say otherwise. This mismatch between theory and observations is dubbed “the Strong CP problem” CP stands for Charge+Parity. What is the CP problem, and why has it puzzled scientists for almost half a century? ....