Mars was once a small, wet and blue world, but over the past 4 billion years, Mars dried up and became the red dust bowl we know today.
But how much water did Mars possess? According to research published in the journal Science, the Martian northern hemisphere was likely covered in an ocean, covering a region of the approximate area as Earth’s Atlantic Ocean, plunging, in some places, to 1.6 kilometers (1 mile) deep. More info
Ceres is the closest dwarf planet to the Sun and is located in the asteroid belt, making it the only dwarf planet in the inner solar system. Ceres is also the smallest of the bodies currently classified as dwarf planets.