"Unearthed: Ancient Planetary Remnants Discovered in Earth's Crust"
Scientists have discovered two massive structures, known as large low shear velocity provinces (LLSVPs), beneath Africa and the Pacific Ocean, which make up around six percent of the Earth's volume. These structures, also referred to as "blobs," have different seismic properties than the surrounding mantle, indicating they are made of something different. One theory suggests that they could be remnants of an ancient planet called Theia, which collided with Earth around 4.5 billion years ago. However, the exact composition and origin of these structures remain unknown, highlighting the ongoing mysteries of Earth's core and the need for further research.