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@whitequark @__Styx__

The ozone layer absorbs roughly 98% of incoming UVB light from both the sun and cosmological sources. Space is, not to put too fine a point on it, *anti-life*. The Earth's atmosphere (the ozone layer being a key part of this) and dynamo molten iron core (which creates our unique magnetic field) are literally the only reasons life exists *at all*.

One of the reasons "colonizing Mars" is nonsense is that it doesn't have either an ozone layer or a strong magnetic field.