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Test Current Number of Potentially Habitable Exoplanets
 Subterran
(Mars-size)

Terran
(Earth-size)
Superterran
(Super-Earth)
Total
Conservative
Habitable Zone
010010
Optimistic
Habitable Zone
0132932
Total0132942

subterran = 0.1 — 0.5 ME or 0.4 — 0.8 REterran = 0.5 — 5 ME or 0.8 — 1.5 RE, superterran = 5 — 10 ME or 1.5 — 2.5 REME = Earth masses, and RE = Earth radii.






{\rm{ESI}}\left( {R,\,\rho ,\,F} \right) = {\prod\limits_{i = 1}^n {\left[ {\frac{{2\sqrt {{x_i}{x_{oi}}} }}{{\left( {{x_i} + {x_{io}}} \right)}}} \right]} ^{{w_i}}}

{n = 3}    {x = \left( {R,\,\rho ,\,F} \right)}    {{x_o} = {{\left( {R,\,\rho ,\,F} \right)}_{{\rm{Earth}}}}}    {w = \left( {4,\,4,\,4} \right)}

{\rm{ESI}}\left( {R,\,\rho ,\,{v_e},\,{T_s}} \right) = {\prod\limits_{i = 1}^n {\left( {1 - \left| {\frac{{{x_i} - {x_{io}}}}{{{x_i} + {x_{io}}}}} \right|} \right)} ^{\frac{{{w_i}}}{n}}}

{n = 4}    {x = \left( {R,\,\rho ,\,{v_e},\,{T_S}} \right)}    {{x_o} = {{\left( {R,\,\rho ,\,{v_e},\,{T_S}} \right)}_{{\rm{Earth}}}}}    {w = \left( {0.57,\,1.07,\,0.70,5.58} \right)}