A ronnagram represents 10^27 grams, or one octillion grams. The ronna prefix was introduced to the SI system to measure extremely large astronomical bodies like gas giants and stars without resorting to massive scientific notation. Jupiter, for example, has a mass of about 1.9 million ronnagrams.
Heard on the job
When calculating the mass of the Jovian system, we can now express Jupiter as almost two million ronnagrams.
Insider tip
The symbol is Rg, with a capital R. It sits exactly one thousand times larger than a yottagram and one thousand times smaller than a quettagram.