Mars was once covered in a deep ocean that might have harboured forms of life.
Mars was covered in a deep ocean that might have held life
Researchers are convinced that the Red Planet had enough water on it 4.5 billion years ago to be covered entirely by an ocean between 300 metres and 1km deep and suggest that life could have existed on Mars.
Dr. Martin Bizzarro, of Copenhagen University, said: "Mars was bombarded with asteroids filled with ice in its first 100 million years, which brought the water."
He continued: "Another interesting angle is that the asteroids also carried organic molecules that are biologically important for life.
"It is believed that there was a gigantic collision between the Earth and another Mars-sized planet. It was an energetic collision that formed the Earth-Moon system and, at the same time, wiped out all potential life on Earth."