Mars interior got scanned lately by the Mars Express probe, which has a 50m long radar antenna available. No indication of large cavities found in the penetration depth of the radar (around 300m)What is known is, that Mars had a magnetic field - it's crust still has noticeable magnetism pattern...
No, and it is no theory, it is only a hypothesis. A theory is a hypothesis that is confirmed by having its predictions met by experiments - it "holds water". The Hollow earth claims are actually already wrong from the start, but that didn't stop people (eg, Newton calculated that the density of...
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