Scientists have discovered a planet described as "strange," formed largely from volcanic lava and nearly identical in size to Earth. This planet exists outside our solar system, is about ten times younger, significantly hotter, and likely has half of its surface submerged in seas of molten lava. Astronomers found the new planet using NASA's TESS probe, designed to discover thousands of exoplanets orbiting the brightest dwarf stars in space. According to scientists, it is the smallest and closest known exoplanet, located just 73 light-years away. They estimate that its age is around 400 million years, which is quite peculiar compared to our planet's age of 4.5 billion years. The discoverers noted in a new research paper published in the astronomical journal, "Young Earth-like worlds serve as a critical test to constrain prevailing theories about planet formation and evolution."