Ancient Planet Hides Inside Earth for 4 Billion Years

Why is space exploration important? It allows us to get to know our own planet better! 🌏 There're so many questions to answer: "what if Earth had rings?" "what if Earth had no moon?" What if there's another planet hiding inside ours? And it's true! Scientists claim the remains of an entire planet have been found inside the Earth! A protoplanet slammed into Earth long time ago... and it's still there.