When the satellite is facing the sun, for example, you could cool it by closing our shutter doors and reflecting the heat. Or if you need to absorb more heat, the shutters would open.

This is the first time a fully space-qualified device of this type has ever been flown, and the first to be flown on the outside of a satellite.

Often people associate small with being frail. But our tiny shutters, which don't touch when they close, are exceptionally strong, especially when operating in space where there's no gravity, weight or resistance forces to wear or degrade moving parts.

Tim put other people before himself. He was an example of how you would want to be. Tim loved people.

When a product reaches the point of spoilage, there will be other signs that will be evidenced — for example odor, slime formation and a bulging package — so the product will not smell or look right.

When a product reaches the point of spoilage, there will be other signs that will be evidenced – for example odor, slime formation and a bulging package – so the product will not smell or look right.