Could there be animals on Mars? Maybe so! Scientists found something interesting on Mars——a picture of a bear's face! It seems to have been carve(雕刻) on Mars.
A machine called the Mars Reconnaissance Orbiter took the picture. It can take crucial pictures of Mars, which helps scientists learn about Mars. Scientists at the University of Arizona looked at the picture and found that a hill that fell down, two holes and a round shape made the bear's face.
The scientists think that the round shape appeared because something might cover a hole. They are still learning about the bear's face. They think they can find more from the picture.
The Mars Reconnaissance Orbiter found other interesting things on Mars too, like dust devils(尘卷风) twirling across the Martian surface(表面). The scientists want to learn more about Mars so they can send robots or people there in the future.
But the scientists haven't found any little green men on Mars yet. A long time ago, people thought there might be aliens(外星人) on Mars, but the scientists haven't found any proof(证据) yet.The scientists will keep looking for other interesting things on Mars. Although it's difficult, they will not give up. There is still a long way to go.