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ALT In this cartoonish illustration, OSIRIS-REx descends on a purple, rocky surface. An inset shows a circular device with small circular pads. An arrow points to one of the pads and identifies it as a collection pad.

ALT OSIRIS-REx Pi Day Problem 2021: NASA’s OSIRIS-REx mission was designed to travel to an asteroid called Bennu and bring a small sample back to Earth for further study. To achieve its mission, the spacecraft needed to make contact with 26 cm2 of asteroid Bennu’s surface and collect millimeter-size particles using its "contact-pad samplers." These are 1.5-centimeter diameter circular pads of Velcro-like stainless steel. There are 24 pads on the mechanism designed to collect the samples. How many pads needed to make contact with Bennu's surface to meet the mission requirement? If all 24 pads contacted Bennu, how much asteroid surface area would the contact pads sample?














