How many lonely planets in the universe?

In 2012, scientists discovered the first lonely planet, which was 100 light-years away from Earth. Since then, hundreds of lonely planets have been discovered over the past few years. In 2023, scientists have found about 540 rogue planet-like planets. The first planets discovered were much larger than Earth; Jupiter-like. But recently, scientists have found some Earth-sized lonely planets. There is a strong possibility of finding a lonely planet similar to Earth in the future. Many scientists think that there are about 50 billion rogue planets in our Milky Way Galaxy. And there are probably trillions of rogue planets in the universe. In the future, we may encounter a lonely planet that comes close to our solar system.