<P> Mercury , the smallest and innermost planet , has no moons , or at least none that can be detected to a diameter of 1.6 km ( 1.0 mi ) . For a very short time in 1974 , Mercury was thought to have a moon . </P>
<P> Mercury , the smallest and innermost planet , has no moons , or at least none that can be detected to a diameter of 1.6 km ( 1.0 mi ) . For a very short time in 1974 , Mercury was thought to have a moon . </P>
which planet is 5.5 of earth 's mass and has no moon
which planet is 5.5 of earth 's mass and has no moon
Mercury
Mercury