Planet 9

Planet Nine, also called Planet X, is a hypothetical planet orbiting beyond Neptune. This theory would explain the anomalies in the Kuiper Belt. Planet 9 could have a weight (mass) about 5 to 10 times the weight of Earth. Since this planet should orbit far away, it would take between 10000 to 20000 Earth years to orbit the Sun. The brightness (Magnitude) of Planet 9 could be around 21, which means that it is very dim.

 Related pages 

 Tyche (planet)
 Solar System

 References 

 https://science.nasa.gov/solar-system/planet-x/

 Other websites 

 https://edition.cnn.com/2024/11/04/science/planet-nine-kuiper-belt-latest-evidence/index.html

Category:Solar System planets