Lightning is electricity inside a could. Scientists do not know exactly what makes this electricity. But they know that the electricity inside a could can be as much as 100 million volts. From this extremely strong electricity, a lightning bolts, 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. That's almost five times the temperature on the sun's surface. The lightning bolt is very quick. It can move at a speed of 87,000 miles per second. A rocket traveling at this speed would reach the moon in 2.5 seconds. With the lightning bolt, we usually hear thunder, which is the sound of hot air exploding. Lightning