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So one of the unique challenges of the OSIRIS-REx mission is the microgravity

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environment that we're going to, which is very different from us than orbiting a planet as we're used to.

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Without the large gravity of a planet, the navigation uncertainties affect

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us a lot more. And the non-gravitational forces on the spacecraft affect our

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trajectory in ways that make it much more dynamic from a power and thermal point of view

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on the spacecraft. We're also working on a much shorter turnaround times since our

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optical navigation has to be downlinked every day and that drives a much faster turnaround times

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for us from a data and downlink point of view.