3.84 x 10-19 joules.
518 mm = 20.394 inches (rounded)
See the related link.
A misspelling of Gliese 581 e perhaps?
kelvin = celsius + 273 kelvin = 245 +273 kelvin = 518
The circumference is about 155609 KM (equitorial).96,685 miles (155,600 km).
The wavelength IS 518 nanometers.... but in meters, it is expressed as 5.18 x 10-7 m. when you multiply by the conversion factor of 10-9
518 = 51,800%
518
The factors of 518 are: 1 2 7 14 37 74 259 518
37 divide by 518 = 0.07142857142857142
518+475 = 993
20% of 518 = 103.6
518 x 7 = 3626
They are 37*7*2 = 518
2.8x10-19 JE = hν, and ν = c/λ. λ is wavelength, c is the speed of light (3.0 x 108 meters/second), E is energy, and h is 6.626 x 10-34. 3.0 x 108/715 = 419580.42. 419580.42 x 6.626 x 10-34 = 2.78 x 10-28 joules.
518 is only divisible by 2
It is 18.'518'% recurring '518'