Light waves from an object speeding away from you will stretch into longer wavelengths.

VOA: special.2009.04.29

He says water also holds some of the major wavelengths that identify asbestos.

VOA: special.2009.11.17

The mapper is a spectrometer, a device that measures reflected light wavelengths.

VOA: special.2009.09.30

He says they depend on a limited number of radio wavelengths.

VOA: special.2010.01.26

The Mapper is a spectrometer, which measures reflected light wavelengths.

VOA: special.2009.12.30

The team's sensor devices were set on differing wavelengths.

VOA: special.2009.11.17