The LHS 1903 system defies expectations with a rocky outer planet, prompting new ideas about how planets form and evolve. As astronomers discover more exoplanets, it is becoming clear that our solar system and its past may be unusual. A fourth planet recently identified in the LHS 1903 system by the European Space Agency’s CHEOPS [...]

A newly studied planetary system appears to break the expected order of worlds, revealing an unusual arrangement that current theories struggle to explain. “Many Vile Earthlings Munch Jam Sandwiches Under Newspapers” and “My Very Educated Mother Just Served Us Nachos” may sound like nonsense, but they are classic memory tricks used to teach the order [...]