Definition/Meaning  Word/Phrase 
system of two stars that revolve around each other under their mutual gravitation 
binary
,
binary star
,
double star

(physics) the universal constant relating force to mass and distance in Newton's law of gravitation 
constant of gravitation
,
G
,
gravitational constant
,
universal gravitational constant

English mathematician and physicist; remembered for developing the calculus and for his law of gravitation and his three laws of motion (16421727) 
Isaac Newton
,
Newton
,
Sir Isaac Newton

hypothetical subatomic particle of large mass that interacts weakly with ordinary matter through gravitation; postulated as a constituent of the dark matter of the universe 
weakly interacting massive particle
,
WIMP
