Thursday, July 1, 2010

Space Station Visible All Night Tonight

The International Space Station (ISS) has entered the "twilight zone," giving sky-watchers in select places around the world unprecedented multiple views of the orbiting facility tonight.

The space station isn't always visible at night when it passes overhead, because it spends about 30 percent of its time cloaked by Earth's shadow. But once a year the high-flying facility's orbit closely parallels what's known as the day-night terminator, the zone of perpetual twilight on the border between Earth's dayside and nightside. When it's in the zone, the ISS can be seen with the naked eye every time it passes overhead, from dusk til dawn.

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