Simulations of how star systems form predict that small stars like TRAPPIST-1 and LHS-3154 shouldn't be able to pull together enough material around them to form giant planets like Neptune. But apparently nobody showed those simulations LHS-3154, a red dwarf star about 51 light years away.
LHS-3154 is a tiny, tiny star, about a tenth as massive as our Sun, so it should have a relatively small planetary system. The gravity of a newborn star tends to pull material toward it: gas, dust, and ice.
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