Peter Goldreich
Peter Goldreich ( born July 14 , 1939 ) is an American astrophysicist whose research focuses on celestial mechanics , planetary rings , helioseismology and neutron stars . 
<triplet> Peter Goldreich <subj> July 14, 1939 <obj> date of birth <subj> American <obj> country of citizenship <triplet> astrophysicist <subj> neutron star <obj> studies