What would be necessary if water is not sufficiently abundant on the surface of Mars?
Answer
The redirection of icy comets or asteroids to the planet
A significant physical challenge in planetary engineering is resource availability. If the Martian polar ice caps do not provide enough water for the terraforming process, engineers would need to secure external sources. This would require the logistical capability to mine asteroids or redirect icy comets and transport them across the solar system to deposit their water content onto Mars.
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