According to recent estimates, around 350 light years or 107 parsecs
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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!
beta glucose
is bacillus subtilis beta or alpha hemolysis
No. For a convex combination of distributions, the density is also a convex combination of the individual densities and one can easilly check that the convex combination of beta densities is not again a beta density.
A beta particle is an electron, with a mass of approximately 1/1840 of a proton