The bracelet may have two parts, a touch sensitive flexible display and a solar power collector.

FORBES: Apple Patent For Solar Watch Could Fire Up Stock Again

Put a solar cell at the focus of that mirror and you have an inexpensive solar-energy collector.

ECONOMIST: Monitor

Genesis had painstakingly deployed the collector tiles and foil over the last two years to capture atoms from the solar wind.

CNN: High hopes to salvage Genesis science

An IBM-led group is working on a new collector dish that could avoid that damage while taking a big step forward in solar power efficiency.

ENGADGET

As we orbited the sun, we exposed the back side of the collector to stardust, interstellar grains, that are actually coming in to our solar system at the present time.

NPR: Stardust Set to Deliver Comet Samples