The Curiosity Mars rover photographed more rocks that are shaped like coral on the red planet's surface. Researchers said the rocks were evidence that at one point water was on Mars. The Curiosity rover has been on the red planet for over 13 years.

This is because these objects formed “billions of years ago when liquid water still existed on the Red Planet. Water carried dissolved minerals into rock cracks and later dried, leaving the hardened minerals behind,” as explained by NASA in a recent statement.