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Mike from Iowa City, he asks, what factors are considered in determining the time of day this launch will occur?

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Well, there are actually several factors, one of which is you have to have an orbiter that's ready to go fly, all systems go.

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Two, there is a certain amount of energy that it takes to liftoff and rendezvous with the International Space Station.

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And depending on where it is in space or on orbit, it can limit the times in which you can launch.

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Also, up on space, or on orbit, there are temperature extremes, heat and cold, that drive your launch time.

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And finally, for this particular mission and the next, we want to fly during daylight hours so that our

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film cameras can pick up any debris that might come loose from the tank or the Solid Rocket Boosters.

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