Billions of years ago, Earth collided with its twin planet Theia. The impact and resulting geophysical changes prepared Earth for complex life.
- 4 billion years ago Earth had a twin called Theia.
- Theia was about the size of Mars, and was on a similar orbit to Earth.
- As the force of gravity between Theia and Earth grew, they pulled each other off course and collided.
- Following the collision with Theia, Earth grew large enough to sustain an atmosphere.
Early in Earth's life, over 4 billion years ago – our planet had a twin called Theia.
Theia gave Earth the chance to harbour life.
About the size of Mars, Theia was on a similar orbit to Earth.
As the force of gravity between the two planets grew, they began pulling ...