Earth Had a Twin Planet Called Theia!!

Scientists now believe that we were once not alone in our orbit around the Sun – we had a “twin” planet we call Theia, which was the size of Mars and was 60 degrees either in front or behind our Big Blue Ball. One afternoon about 4.533 billion years ago, Theia crashed into the Earth; most of the planet was absorbed, but a large chunk blew off and combined with materials from our planet to create the Moon. Why do we think this? It's because our Moon is unusually large for a planet of our size and has metallic isotopes similar to those on Earth.