Pluto a dwarf planet located far reaches of the solar system in the Kuiper belt, a ring of bodies beyond Neptune. It was the first Kuiper belt object to be discovered. Pluto was discovered by Clyde Tombaugh in 1930 and was originally considered to be the ninth planet from the Sun. After 1992, its status as a planet was questioned following the discovery of several objects of similar size in the Kuiper belt. In 2005, Eris, a dwarf planet in the scattered disc which is 27% more massive than Pluto, was discovered. This led the International Astronomical Union (IAU) to define the term “planet” formally in 2006, during their 26th General Assembly. That definition excluded Pluto and reclassified it as a dwarf planet. It has a moderately eccentric and inclined orbit during which it ranges from 30 to 49 astronomical units or AU (4.4–7.4 billion km) from the Sun. This means that Pluto periodically comes closer to the Sun than Neptune, but a stable orbital resonance with Neptune prevents them from colliding. Light from the Sun takes about 5.5 hours to reach Pluto at its average distance (39.5 AU). On average it is 40 times more distant from the sun than earth is. It’s surface area is 17,600,000 km, which is slightly bigger than Russia’s 17,100,000 km. If you put it into real perspective you can fit 150 pluto into earth, So what if this small dwarf planet were to become a moon of Earth, that would mean that Pluto would need to get closer to the Sun which would provide quite a few drastic changes to its surface. Pluto has five known moons: Charon (the largest, with a diameter just over half that of Pluto), Styx, Nix, Kerberos, and Hydra. Pluto and Charon are sometimes considered a binary system because the barycenter of their orbits does not lie within either body. Pluto will need to travel a passive 7.3 billion kilometers even light takes five hours to reach Pluto from Earth. So it would need to travel a path of five light hours which could take a very long time going hundred thousand kilometres per hour it would take little about eight years to reach Earth, but that is depending on speed of course. So the surface of Pluto is 98% nitrogen, ice melting point of nitrogen is – 210 Celsius and boiling point – 195 Celsius, but as pluto approaches earth because it would be closer to the Sun temperature of pluto would rise melting all the nitrogen in creating a nitrogen ocean, which would cover the whole surface of Pluto only solid thing in the surface of Pluto would be water ice and bedrock mountains which would be sticking out the nitrogen ocean it would be quite a magnificent sight, but interestingly Pluto’s moon Charon would not experience a lot of changes because it is made out of water ice. So it would be solid but magnificent nitrogen oceans of Pluto would not last for very long because as Pluto would approach the earth more getting even closer to the Sun nitrogen will reach the boiling point making all the nitrogen oceans to slowly evaporate and creating a very blue and somewhat thick atmosphere that will mostly be nitrogen in the atmosphere will last for a few thousand years because of low gravity, but its surface area is going to be mostly water ice since it is the layer underneath of the nitrogen ice surface and water gets frozen at 0 Celsius this will be in the – meaning it will be a frozen water ocean. It will be like that for a long time, until it reaches the orbit of Earth where temperature is usually in + depending on an atmosphere there. Water on ice layer of Pluto will start to unfreeze creating a water ocean covering the surface holes as well could be possibly created oceans will likely stay liquid throughout day and night because of the atmosphere so heat would be transformed normally. Its moon Charon freezes during the night and becomes liquid during the day because of the temperature variation without an atmosphere.
Now Pluto could barely gets to be a satellite of Earth but if it keeps a normal distance from the moon it would stay in orbit but Pluto’s moon Charon would likely be ejected out of the orbit flying into outer space, so that would mean that earth would have two Pluto and the moon or Luna. So since Pluto is quite a small object even smaller than the moon and it is smaller by a lot than the surface area on moon is double the area of Pluto and surface gravity of the moon 1.62m/s2 is more than 2 times stronger than Pluto 0.62m/s2. So if Pluto is let’s say 500,000 kilometers away from the earth it would not have that much effect than the earth, tides and waves would be a bit bigger and length of the day could change by a few minutes, but in general everything and everyone on earth would likely be so. Pluto would appear as a small blue ball in the sky it would be smaller than the moon but it would look quite magnificent with flowing oceans that would be quite deep maybe even more so than the Earth’s ocean. In fact with Pluto being our moon it would have more upside than downside Pluto would provide quite a nice place to colonize, it would have water and good enough temperature with a blue and somewhat to take atmosphere, but the atmosphere well after a few thousand years go away and it will return to the old thin atmosphere meaning temperature will again begin to be unstable likely from 50 Celsius that day and minus 50 Celsius at night meaning oceans will freeze during the night and be liquid during the day. Still human by that time we’ll likely figure out a way to keep an atmosphere so of course Pluto will not begin to drift towards Earth it’s just a fun idea to see what would happen and it looks like it is quite a good thought that would provide humans another place to live on which would extend humanity.