it's because that they were asteroids that was bigger then Pluto so it was hard to find out which is Pluto and which are the asteroids
pluto
for two reasons:Pluto is not a planet. It is a dwarf planet.There are 3 more dwarf planets that orbit the Sun beyond Pluto.
Pluto was classified as a dwarf planet last 2005. Pluto was too small to be considered as a planet anymore. Its orbit was also not like any of what we call our planets. There are three dwarf planets in our solar system.
Neptune or maybe Pluto, although it's considered a dwarf so not an official planet anymore.
Actually, Pluto is definitely not the last planet in the solar system. Pluto is the tenth planet, out of 18 planets and two protoplanets, and is binary, partnered with Charon. It is preceded by Orcus, and proceeded by Haumea.For a complete list of common objects in the solar system, see related links.
Neptune, Pluto has lost its status as a planet. Since then, many dwarf planets have been discovered beyond Pluto.
It wasn't discovered to not be a planet, it was decided to no longer be a planet. Recently, the last 2 or 3 years scientist decided (not all) it was not an official planet.
Pluto is not the last planet technically. Now it is a dwarf planet as it became to small to be considered a planet. Pluto is not the last planet. It is called the last planet as it is the furthest away planet that orbits our sun. There are many other planets further away from us than Pluto.
Pluto is a small, rocky dwarf planet with a surface temperature of -382Farehiet (-230 Celsius. Pluto is covered with ice and frozen gases. Scientist are not sure what is INSIDE Pluto.(last i checked...)
the scenod to last dwarf planet is: ceres is the second to last DWARF PLANET i think.
Pluto didnt get replaced, its still there. There were other planets like Pluto that were discovered in the last couple of decades or so - the same sort of size and further out from the sun. These include Makemake and Sedna to name a couple.
Pluto is so lonely because its is the last planet in the solar system and it is so small. Also technically, Pluto is not really considered a planet anymore. So Pluto's so lonely because of all those reasons.