"Intruder Among Us: The Alien Planet Invasion Theory of Our Solar System"
A new theory proposed by Princeton astrophysicist Amir Siraj suggests that a rogue planet, possibly the size of Earth or Mars, may have been captured by the sun's gravity and could be lurking in the outer reaches of our solar system. This theory is based on calculations of rogue planets in space and the likelihood of their capture during the solar system's formation. While no such planet has been detected yet, the upcoming Large Synoptic Survey Telescope in Chile could potentially discover these hypothetical alien planets when it becomes operational in August 2025.