The young sun may have captured several Mars- or Mercury-size exoplanets that now orbit in the outer reaches of the solar system, but identifying them will be extremely challenging.
Avi Loeb leaned in, grabbed my hand and said, “Be as critical as you like.” What, after all, was one more critic? He resembled a caricature of a scientist, his body wiry and short, in a plaid tailored suit, holding an expression that suggested both the severely etched Oppenheimer and the anxious, chain-smoking lawyer Martin Short played years ago on “Saturday Night Live.” Certainly, that’s the .