Proxima Centauri is a star and there is no scientific notation for a star. There will be scientific notations for the values of its distance, its size, its age, luminosity, magnitude and so on but the question is not about any of them!

There are 2 values of scientific notation in the number given and they are:- 437100 = 4.371*105 in scientific notation 0.00000000006 = 6.0*10-11 in scientific notation

Scientific notation is a way of representing numbers - particularly very large or very small numbers. There is no difference in the way in which it applies to metric units or other units.