Lightning is electricity inside a cloud. Scientists do not know exactly what makes this electricity. But they know that the electricity inside a cloud can be as must as 100 million volts. From this extremely strong electricity, a lightning bolt, like a streak of bright light, comes down from the sky. Its temperature can reach 50,000 degrees Fahrenheit within a few millionths of a second . Thai's almost five times the temperature on the sun's surface. The lightning bolt is very quick.