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The Busy Center of the Lagoon Nebula

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Comparison of a picture from Mars (left) to a picture from Earth (right) (lemmy.world)

submitted 2 months ago by [email protected] to c/[email protected]

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[–] [email protected] 37 points 2 months ago (14 children)

Aren't the layers in the rock showing that water was definitely present on Mars, and that they're formed by sediment being deposited and forming into sedementary rock over time?

[–] anindefinitearticle 9 points 2 months ago

Yup!

Sediment gathers at the bottom of a lake or sea. Builds up deeper and deeper layers. Each layer is formed by a sediment deposition event. Each layer you go down is going further into the past of that former water body.

Because sedimentary rock requires standing bodies of liquid to form, they are only found on Earth and Mars (and maybe Dragonfly will find sedimentary deposits on Titan which would be very different in chemistry).

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