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A solar sail could enable SWIFT to enter an otherwise unstable sub-L1 orbit without the risk of running out of fuel. NASA successfully launched its first solar sail in 2010.

A solar sail is a hair-thin reflective surface—simulating a very thin mirror—that spans about a third of a football field.

A solar sail could enable SWIFT to enter an otherwise unstable sub-L1 orbit without the risk of running out of fuel.