Scientists have had proof since 2013 that water once flowed on Mars, when NASA's Curiosity rover found smooth, rounded pebbles—like those seen in Earth's rivers—on the Martian surface.
A 2021 paper on NASA's Perseverance Mars rover mission revealed more details about Jezero's watery past.
In July 2021, Scientists discovered new detail about Mars' makeup thanks to NASA's Insight probe.
According to NASA the three papers based on the seismometer's data published in Science, "provided details on the depth and composition of Mars' crust, mantle, and core, including confirmation that the planet's center is molten.
Scientists now think Mars' core is molten, but are yet to determine whether Mars has a solid inner core like Earth's.
Scientists think Mars contained much more water billions of years ago, but are less sure about the reason for the water escaping
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