Well i read it somewhere that earth is a very big coincidence,,,a few hundred thousands miles closer to sun and oceans will vaporise and a few hundred thousand miles away from sun, everything will freeze..and as for human beings even a temperature difference of a 100F is unmanagable that we depend on A/c and heating system to limit it to a few degrees,,well i guess those lives dwelling in other planets or systems should be different indeed that can survive probably the conditions that would be deemed harsh indeed by the earthly standards