since 1999
As of my last update, astronomers have not discovered a new planet in our solar system. However, new exoplanets outside our solar system are routinely being discovered using various observational techniques.
No new planets have been discovered in our Solar System since 1930 when Pluto was discovered - now demoted to a dwarf planet. See related question for details and links of all the new exoplanets found.
New planets are more or less constantly being discovered outside the Solar system. There are almost certainly no unknown planets still lurking within the Solar system, though.
Kepler discovered the orbits of the solar system are elliptical.
Jupiter is the largest planet in our solar system.
NASA is constantly searching for new planets beyond our solar system through various missions like the TESS and Kepler telescopes. They have discovered thousands of exoplanets so far, but have not announced the discovery of a new planet in our solar system.
That would be UB313, discovered in 2005,
there is no new ideas on the solar system
gallilao
There were two new planets discovered in our solar system. One is called pilosmith and I forgot the other one. However, they are smaller than Pluto so I don't think the astronomers officially count them as planets. Yea and the other ones name is Typhoon
As of now, there is no confirmed discovery of a new planet in our solar system. However, researchers continue to search for potential undiscovered planets beyond Neptune in the Kuiper Belt and beyond.
They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.They have discovered some hundred planets outside our Solar System. Whether some of them are similar enough to our planet to be called "an earth", is open to debate.