Astronauts aboard the space shuttle Discovery caught this view of the sun setting behind Earth on July 15th of last year. Orbital sunsets and sunrises occur approximately once very 90 minutes, which is how long it takes manned spacecraft to orbit once around Earth. I've hopefully convinced you that there's more than one way to say goodnight, but what about more than one time to say goodnight? If orbital sunrises and sunsets occur every 90 minutes, that means there are 16 different times during a 24-hour day that astronauts could say goodnight or good morning to each other. Something tells me the novelty might wear off after the first, oh, 3 or so.
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