Mother Nature paints an electric-blue sky with a bold twist of lightning. Lightning and thunder occur simultaneously, but because light travels faster than sound, we see lightning first. Count the seconds between a flash of lightning and a clap of thunder and divide by five to estimate how far away in miles the storm is. Divide by three for kilometers.
Shocks of lightning split a cloud formation over Lake Tanganyika in Tanzania. Tanzania's neighbor, the Democratic Republic of Congo, is home to the world's most lightning-pelted region, which, according to NASA, absorbs 158 thunderbolts per square kilometer (0.4 square miles) every year.
Lightning streaks across the sky over Vinales Valley, Cuba. Lightning can travel up to 93,000 miles (150,000 kilometers) per second and reach temperatures of 54,000 degrees Fahrenheit (30,000 degrees Celsius), more than four times hotter than the surface of the sun.
Whips of lightning cut a dramatic scene across a storm-darkened sky in Patagonia, Argentina. Most lightning occurs within cumulonimbus clouds like these, but it can also be released from wide, layered formations called stratiform clouds.
Photo Gallery: Lightning
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Iamthaonguyen
A purplish twilight sky over Georgia's Cumberland Island National Seashore glows as fingers of lightning spread among the clouds.
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