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weristjonsnow t1_iwwhmbk wrote

Reply to comment by MidnightPlatinum in Mars was once covered by 300-meter deep oceans, study shows by magenta_placenta

Once a planetary core stops spinning you lose your em field. Em field protects atmosphere from floating away. Mars has a dead core

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Bensemus t1_iwyge56 wrote

This isn’t true. Venus doesn’t really have a magnetic field yet has an atmosphere so dense it would crush you. Planet mass is way more important.

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merkitt t1_iwy9or9 wrote

Can't we send in an impeller-driven craft to the core to restart the rotation with strategically placed nuclear charges?

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Crowbrah_ t1_iwyalfh wrote

That's crazy talk. What we actually need to restart its core is a giant electromagnetic pulse device to fire down into Mars's fault lines. Some sort of Deep Mars Seismic Trigger Initiative or something or other.

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merkitt t1_iwyhhdt wrote

Heh, I haven't watched that one

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Crowbrah_ t1_ix2ipf1 wrote

It's from the same film lol, The Core. 'DESTINI' was the mcguffin that caused the core to stop rotating in the first place.

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StrangeTangerine1525 t1_iwzvwe4 wrote

There are many other methods of atmospheric escape a magnetic field can't protect against. UV rays, thermal escape processes, 'freezing' of the atmosphere into a planets crust. A magnetic field isn't the "big factor" in terms of whether not a planet has an atmosphere or not. Look at Venus and Titan, the two other places in the solar system that aren't gas giants and have atmosphere's besides Earth (and Mars). Neither of them have an intrinsic magnetic field and they still have substantial atmospheres.

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