Yes, numerous new planets have been discovered since the discoveries of Pluto and Neptune. In fact, the number of known exoplanets (planets orbiting stars outside our solar system) has increased dramatically in recent years.
Here are some key milestones in planetary discoveries:
Exoplanets: The first confirmed exoplanet orbiting a Sun-like star was discovered in 1995. Since then, thousands of exoplanets have been detected using various methods, such as the transit method (detecting the dip in a star's brightness as a planet passes in front of it) and the radial velocity method (detecting the wobble of a star caused by the gravitational pull of an orbiting planet). These discoveries have revealed a wide range of planetary systems with diverse characteristics.
Kuiper Belt Objects: The discovery of Pluto in 1930 was a significant milestone. However, as our understanding of the outer solar system has evolved, Pluto is now classified as a dwarf planet. In addition to Pluto, the Kuiper Belt—a region beyond Neptune—has been found to contain many small icy bodies, some of which are considered dwarf planets as well. Examples include Eris, Haumea, and Makemake.
Other Discoveries in the Solar System: Since the discovery of Neptune in 1846, other objects have been discovered in the outer reaches of our solar system. Notable examples include Sedna, a large trans-Neptunian object, and various dwarf planets like Ceres in the asteroid belt.
It is important to note that discoveries in the field of astronomy continue to be made, and new planets and celestial objects are constantly being studied and identified. Our understanding of the universe and the diversity of planetary systems is an ongoing and exciting area of scientific research.