And that’s good, because there is a lot of work to do. In Jezero Crater, the rover is studying some of the most ancient rocks in the Solar System, older than any on Earth, dating as far back as about 4 billion years ago. At the time, the planet was in the later stages of the “heavy bombardment” era when rocks were still whizzing around the inner planets in great numbers. But things were starting to settle down.
“It’s the first time we’ve been able to investigate this terrain in situ, and that’s been very exciting,” Sun said.
During this era, large lakes and possibly even oceans are thought
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