NASA's Perseverance Mars Rover

And all the low-lying terrain in this image was under water...

I am fascinated by Mars as it is. Even so, this amazing image really forces me to stop, and stare, and imagine this scene, imagine Mars, as it was. It's artfully framed, yes, but I'm still stunned to visualize how those old, low, rounded-down ridges in the background would look entirely different if they were encompassing open water. Every time you think you're starting to understand Mars...