Which of the following planets have no moons

Distance From the Sun Mercury and Venus are the two innermost planets. One major factor contributing to the fact that neither Mercury nor Venus has moons is likely the distance between these worlds and the sun. Since Mercury and Venus are the two innermost planets, they experience a higher gravitational pull from the sun than the other planets. The sun’s gravity likely prevented the formation of any moons around Mercury and Venus. If any natural satellites did form around these two planets, chances are that the sun’s gravity would have prevented them from entering stable orbits. In the case of Mercury, any moon would have to orbit so close to Mercury that it would probably impact the planet’s surface, and if a moon formed too far away, it would be captured by the sun’s gravity. However, given Mercury’s distance from the sun, it is unlikely that the debris needed to form a moon would even fall into orbit around Mercury, and instead, it would be captured by the sun’s gravity. While Venus is the second closest planet to the sun, it is still far enough away that a moon could form in Venus’s orbit. Interestingly, astronomers believe that Venus may have had a moon in the past, and the evidence for this comes from Venus’s rotation. Venus has the slowest rotation of any planet, and it takes 243 days for Venus to complete one rotation about its axis. Furthermore, Venus experiences what’s called retrograde motion. While every other planet rotates counterclockwise, Venus rotates cloc...

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The four giant outer planets are much more massive than the terrestrial planets and have immense atmospheres composed mainly of hydrogen and helium. They have no solid surfaces, however, and their densities are so low that one of them, Saturn, would actually float in Most of the known moons move around their respective planets in the same direction that the planets orbit the The physical characteristics of Comets can be classified according to their orbital period, the time it takes for them to revolve around the Sun. Comets that have orbital periods greater than 200 years (and usually much greater) are called long-period comets; those that make a return appearance in less time are short-period comets. Each kind appears to have a distinct source. The nucleus of a typical long-period comet is irregularly shaped and a few kilometres across. It can have an orbital period of millions of years, and it spends most of its life at immense distances from the Sun, as much as one-fifth of the way to the nearest