![An artist's concept of planet KELT-9 b and its host star](jpg/kelt9bwithstar_1600-leadc72e.jpg)
The Strangest Alien Worlds Are beyond Astronomers’ Wildest Dreams
Alien worlds that glow like lightbulbs or harbor molten-rock rain are revealing planets’ profound cosmic diversity—and pointing the way toward finding those that truly resemble our own familiar Earth