LHS 1903: The Inside-Out System That Rewrites Planet Formation

A nearby red-dwarf system defies the classic order of planets: a dense inner rocky world, two gas-rich mini-Neptunes, and an outer rocky planet. We unpack the TESS and CHEOPS data, explore the gas-depleted sequential formation idea (the contagious ‘double-stuffed Oreo’ analogy), and show why planet E could only form from leftovers after the gas was gone. If this inside-out architecture is common around M-dwarfs, it expands where we look for rocky worlds and reshapes our understanding of how planetary systems assemble.

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