Why is Earth the third planet, shouldn't it be the first?

New research shows the average human could survive long-term on

Bad Astronomy Water on Mars may have been aborbed by its crust

Planet X: We are closing in on the solar system's new occupant

Why is Earth called 'Earth'? - BBC Sky at Night Magazine

Scientists Find a Possible Sign of Life on Venus - The Atlantic

What's the largest planet in the universe?

Earth is the third planet from the - Primus Public School

Tiny star found harbouring a huge planet that shouldn't exist

Lidunka Vočadlo Culture Online - UCL – University College London

The Search for Intelligent Life Is About to Get a Lot More

Is life possible on Mars? - Big Think

Why is the Earth called the third planet? - Quora

Does the Solar system have a ninth planet after all? - The Hindu