english: Since virtually all the mass of an atom is in the nucleus -- now, there is some amount of mass in the electrons, but most of it is in the nucleus -- how dense is the nucleus?
non_english: Kedže prakticky celá hmota atómu je v jadre – aj keď časť z nej je aj v elektrónoch, aj tak je väčšina v jadre – aké husté je teda jadro?