"The Light Spectrum" This is an illustration of the electromagnetic spectrum. A special section describes the sensitivity of the human eye to visible light.
This movie first shows noctilucent clouds revealed at dusk to an observer on Earth. Then, it moves through the atmosphere and shows the clouds as they appear from outer space.
Troubleshooting
To play MP3 files, you must download and install a helper application or plug-in such as QuickTime, Windows Media Player, or RealPlayer.