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By Jacinta Bowler This image of the Argyre Planitia on Mars really is out of this world! Taken back in February 2021 by the ExoMars Trace Gas Orbiter, it shows Mars’ chaotic terrain of mounds, ripples and huge blue ‘dust devil’ tracks.

If you dug a hole straight down, what would you find? Earth isn’t just solid rock all the way through. There’s a thin rocky crust floating on the slowly flowing mantle, a liquid outer core and solid metal inner core. It turns out that Mars has a similar internal structure to Earth.