molecules

The Northern Lights, also known as the Aurora Borealis, are waving ribbons of green, red and purple in the sky. These curtains of light can be seen as far south as the South Pole. In the southern hemisphere, however, they're called the Aurora Australis. They can also sometimes be seen in New Zealand or Chile.

Computers would be much faster, smaller, and consume less energy if they used light signals instead of electrical signals. That's why many scientists are racing to figure out how to make computers that use light.