Richer said that up to half of the stars in the universe were obscured by space dust and would soon be visible for the first time, thanks to ALMA's ability to pick up sub-millimeter radiation waves that pass through the dust unchecked.

CNN: Telescope set to reveal 'Big Bang'

The Atacama Large Millimeter Array (ALMA), currently being built in the Atacama Desert, northern Chile, will enable scientists to observe sub-millimeter radiation waves, giving them a far more detailed picture of the universe than has previously been possible with either optical or infrared telescopes.

CNN: Telescope set to reveal 'Big Bang'

Backscatter machines use X-rays, while millimeter wave machines use radio waves.

CNN: TSA removing 'virtual strip search' body scanners

In addition to the backscatter machines, the TSA has also deployed about 260 millimeter-wave machines which use radio waves and do not emit X-rays.

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Instead of X-ray scanners, European airports will use millimeter-wave scanners that utilize low-energy radio waves.

FORBES: Europe Bans Airport Body Scanners For "Health and Safety" Concerns