Measured today, the ratio indicates that a proton weighs (just roughly speaking here) 1836.15267261 times more than an electron.
The study team compared the value of mu measured today to the value measured in the light from a pair of quasars, thought to be super-massive black holes sucking in huge amounts of gas and star dust. The quasars' light was measured by study team members at a European Southern Observatory telescope in Chile. Since the quasars are about 12 billion light years away, it has taken 12 billion years for their light to reach Earth, making them indicators of conditions when the universe was only about 1.7 billion years old.
By combining today's mu measurement with the mu measurement from the chemical spectrum of light from the quasars, the European team suggests that mu has dropped by 0.002% over the last 12 billion years.
Rupert Sheldrake's theory of formative causation through morphic resonance suggests that "natural laws" evolve over time, and Dr. Sheldrake has predicted that the so-called universal constants are probably variable, in contrast with most scientific models which have postulated eternal, unchanging natural laws.