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.
1. bernard's star (m4) .2 msun2. 61 cygni a (k5) .7 msun3. alpha centauri a (g2) 1 msun4. sirius (a1) 2 msun5. spica (b1) 11 msun
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