Assertion: spacecraft's panel | /r/AtLocation | the outside of the lander
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Source sentences:
text: ESA expected that a secondary rechargeable battery would be partially filled by the solar panels attached to the outside of the lander, but the limited sunlight (90 minutes per 12.4-hour comet day) at the actual landing site was inadequate to maintain Philae's activities, at least in this phase of the comet's orbit.