Listed below are the names, spectral types (in parentheses), and approximate masses of several nearby main-sequence stars. Rank the stars based on the distances to their habitable zones (from the central star), from shortest to longest.
Barnard's Star (m4) 0.2 Msun
61 Cygni A (K5) 0.2 Msun
Alpha Centauri A (G2) 1 Msun
Siruis (A1) 2 Msun
Spica (B1) 11Msun
