In this episode, Perseverance and Ingenuity make significant discoveries on the Martian delta. Perseverance is occupied with depositing samples for future collection and discovering intriguing substances, while Ingenuity conducts several breathtaking flights over the delta, providing impressive color images.

One of the most notable parts of the episode is when both explorers make their way up the delta through Hawksbill Gap, leading to the discovery of a formation named 'Pinestand.' This feature challenges our understanding of Martian hydrology, as it suggests the existence of an ancient river, larger and faster than any other water system discovered on Mars, flowing into Jezero crater.

The evidence presented in this episode is groundbreaking, demonstrating the scale of water systems on ancient Mars, perhaps rivaling Earth's Mississippi River. This discovery, alongside the visible remnants of what are believed to be sand bars, strongly supports the theory that Mars was once a wet planet.

On Sol 724, plans for a meeting between Perseverance and Ingenuity are revealed, leading to a record-breaking drive by the rover on Sol 728 to witness another flight of Ingenuity. Amidst these achievements, the loss of the rover's hitchhiking pet rock, a small stone that had lodged in the wheel and traveled along for a year, is notably mourned.

Despite minor communication issues due to hilly terrain, Perseverance reaches the Belva crater on Sol 772, and the episode concludes with Ingenuity capturing an image of the rover observing the crater from a distance.
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Credit: NASA/JPL-Caltech/MSSS/Cornell Univ./Arizona State Univ./SSI
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