What if Mars once had roaring waterfalls taller than anything on Earth? Discover the evidence of a four-kilometer-high mega-waterfall and an ancient sea that may have once made the Red Planet look surprisingly blue.
In this breathtaking episode from The Planets, we’re transported back to a time when Mars was anything but dry and lifeless. Using cutting-edge visuals and real data from NASA’s Mars Reconnaissance Orbiter, the video uncovers compelling evidence that Mars once hosted a massive ancient sea—larger than Earth’s Great Lakes—and a colossal four-kilometer-high waterfall carved into Echus Chasma. That makes it the largest known waterfall in the entire solar system.
What hooked us is the powerful “what if?” at the heart of the story. The episode explains how early Mars may have shared surprisingly Earth-like conditions, opening the door to the possibility that it could once have supported life. It’s not just about stunning planetary visuals—it’s about transformation, planetary drama, and how modern science allows us to reconstruct lost worlds.
Watch the full video to explore Mars.
