When the solar system settled into its current layout over four billion years ago, Mars and Earth formed from the same materials and looked very similar. Both are terrestrial planets, with a central core, a rocky mantle, and a solid crust. ... The two worlds diverged, and we have two very different planets today
When the solar system took its present form 4 billion years ago, Mars and Earth were made of the same material and looked very similar. Two terrestrial planets with a central core, a rocky mantle and a hard crust. ...the two worlds have split and today we have two very different planets
