Dear student
Yes it can be considered true.
Beyond Pluto... there is a whole lot of interesting space. It houses the Kuiper Belt (icy rocks) at 30 to 50 AU. This region contains up to a 100,000 objects, many of which could eventually prove to be a dwarf planet like Pluto is today. Pluto itself orbits at 39 AU. Two other dwarf planets, Haumea and Makemake, orbit immediately after.
Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell's quest for Planet X. Lowell proposed the Planet X hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities.
On the summary... we see... there are possibilities of several planets beyond Pluto in the Kuiper Belt:
