February 9, Analysis of Soviet smokedetector plutonium; Pm, 2017 at 8:28 (2017-02-07). "Analysis of Soviet smokedetector plutonium". Special Nuclear Material
upper limit for the size of quarks and electrons sensitivity of the LIGO detector for gravitational waves 10−15 1 femtometre (fm) ಪ್ರೋಟಾನ್ನ ಪ್ರಮಾಣ classical