For the Love of Physics: From the End of the Rainbow to the Edge of Time—A Journey Through the Wonders of Physics

Electrons are so small that some say they have no effective size—they’re less than a thousand-trillionth of a centimeter across—and

the three isotopes of hydrogen, only one, tritium, is radioactive—it decays into a stable isotope of helium.

a clue what that is either. The bottom line is that we’re ignorant about 96 percent of the mass/energy in our universe.

Mercury orbits the Sun in just eighty-eight days,

Electrons are so small that some say they have no effective size—they’re less than a thousand-trillionth of a centimeter across—and

the three isotopes of hydrogen, only one, tritium, is radioactive—it decays into a stable isotope of helium.

a clue what that is either. The bottom line is that we’re ignorant about 96 percent of the mass/energy in our universe.

Mercury orbits the Sun in just eighty-eight days,