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It carries fuel with it. It will carry fuel for a 10-year lifetime (with margin).
Is there any provision for refueling? Could a spacecraft visit JWST and replenish its fuel?
Studies were conducted to evaluate the benefits/practicality/cost of servicing by humans/robots or maybe retrieval to low-Earth orbit, but potential benefits of servicing don't offset the increases in mission complexity/mass/cost. But never say never?
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