You don't actually need to use lead. The key phrase there is "effective strength" so if you have a massive supply of energy at your fingertips, it may be feasible to divert some of it towards the creation of an artificial magnetosphere similar to Earth's own.
Of course you could also use water (obviously in much greater volume), which is a good thing to have in large quantities anyway while you're in space, and is evidently not all that uncommon, at least throughout our solar system.
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You don't actually need to use lead. The key phrase there is "effective strength" so if you have a massive supply of energy at your fingertips, it may be feasible to divert some of it towards the creation of an artificial magnetosphere similar to Earth's own.
Of course you could also use water (obviously in much greater volume), which is a good thing to have in large quantities anyway while you're in space, and is evidently not all that uncommon, at least throughout our solar system.
How much water do you need? Are we talking a pond or the Caspian Sea in space?
Wolfram Alpha tells me you'd need roughly 11x more water than lead, so we're probably talking about a pretty large amount here.