Until now, most researchers have considered the Moon or Mars as the ideal targets for the first step in colonizing our solar system. These destinations have the dual advantage of being close enough to Earth and presenting surface environments that are not entirely hostile to current technological capabilities. Among other possible destinations, Mercury is too close to the Sun, with extreme temperatures and other physical conditions that seem difficult to overcome. Venus is much closer, but its atmosphere is poisonous, extremely heavy, and scorching due to uncontrolled greenhouse effects.
Credit to : Matt Lowne