Now, an unusual new rock collection discovered by NASA’s Perseverance Mars rover suggests the Red Planet’s ancient past was even wetter and more tropical than scientists previously thought, an intriguing new wrinkle in our efforts to figure out if the planet was once habitable. The team compared the rocks with samples from San Diego, California, and South Africa, and found intriguing similarities. “They’re clearly recording an incredible water event, but where did they come from?” Horgan said in the statement. “And right now the evidence in these rocks really points toward these kinds of ancient warmer and wetter environments.”“All life uses water,” Broz added. More on Mars: Scientists Say They’ve Found Caves on Mars That May Contain Life