"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.