Mars Used to Be Gray?! Why It Rusted Early

Did you know that Mars wasn't always the Red Planet we know today? According to a recent groundbreaking study, Mars was once gray — and it may have started rusting much earlier than scientists believed, while liquid water still flowed on its surface.

For years, experts thought Mars became red from iron oxide (rust) long after it had dried up, but this new research flips that idea upside down! If Mars rusted early, this could completely reshape what we know about its ancient climate, atmosphere, and the possibility that life may have once existed there.