We all know Mars is called “The Red Planet,” but have you ever stopped to wonder—why is it red? The classic joke explanation has been, “It’s rusty.” While that’s not entirely wrong, the truth is far ...

A new study claims that a mineral found in Mars' dust called ferrihydrite, which forms in the presence of cool water, is ...

Because of the absence of liquid water on Mars’ surface today, those rusty red minerals were thought to arise from dry iron ...