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...energy saving in addition to time saving. The most exciting reason is the added dimension given to design. For instance, internal structures and features that were formerly impossible can be realised. Furthermore, components that would usually have been made from several parts can be created in a single process. Obviously the financial or environmental implications of a...

...energy locked up in orbital motion and spin) to eventually form a stable moon. Instead, they found that a more feasible way to form the Moon is as the end result of a series of about 20 collisions by Mars-to-moon sized planetary embryos onto the body which later became the Earth. Each collision yielded a debris ring that would soon coalesce into a small moon. But tides...