The second and final total lunar eclipse of the year graced the skies in some parts of the world Tuesday. The next one isn't until 2025.

WHERE IT WAS SEEN: Where skies were clear, the eclipse was visible throughout North America in the predawn hours, with prime viewing in the West, and across parts of East Asia, Australia and the rest of the Pacific after sunset.

HOW LONG IT LASTED: The total phase of the eclipse lasted about 1 1/2 hours. The whole show took about six hours from start to finish.

WHY IT HAPPENS: A total eclipse occurs when the sun, Earth and moon line up perfectly, casting Eart...