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FEATURED PHOTO
Hurricane Jeanne
Marshall Headlines
Motions in nearby galaxy cluster reveal presence of hidden superstructure
Gravity Probe B mission begins collecting science to test Einstein's theory
For release: 03/19/2001
Photo release #: N01-001
Listen to Earth's 'songs,' tweeks and whistles live on the Web from NASA Marshall Center
Medium 667 x 452 (72)
Thumbnail 100 x 100 (72)The source of most VLF emissions on Earth is lightning, as seen from Space Shuttle Columbia. Lightning strokes emit a broadband pulse of radio waves, just as they unleash a visible flash of light. VLF signals from nearby lightning, heard through the loudspeaker of a radio, sound like bacon frying on a griddle or the crackling of a hot campfire. Space scientists call these sounds "sferics," short for atmospherics. (NASA)
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