For in natural ( Planck ) units , the strength of gravity simply is what it is , a primary quantity , while the proton 's mass is the tiny number ( 1 \ / ( 13 quintillion ) ) .
For in Natural ( Planck ) Units , the strength of gravity simply is what it is , a primary quantity , while the proton 's mass is the tiny number ( 1 \ / ( 13 quintillion ) ) ... - June 2001 Physics Today The strength of gravity is simply what it is and the strength of the electromagnetic force simply is what it is .