The atoms in the gas will absorb certain colours of light, each of which corresponds to a particular wavelength.
These can be modified to produce different colours of light, too, but they have not taken off quickly because they can be hard to package.
Fermi and a laundry list of the world's great observatories on the ground and in space were all watching because of a coordinated plan to study Markarian 421 across a number of "colours" of light from radio to gamma-ray.
For the most part, such cloaks have been tiny or limited in the range of colours or angles of light they work with.
Sending large amounts of information down an optical fibre is done by encoding many separate streams of data as pulses of light of different colours, so that they can travel along the fibre without interfering with each other.
ECONOMIST: Optical fibres could carry more information in the future
But first they want to pick out some appropriate swimwear from the store. 10.38.05 Hacer Subtitle What colours were you thinking of? 10.38.07 Asiye Subtitles Light colours.
There the world exploded, dissolving into a kaleidoscope of colours, shapes, spirals and light.
ECONOMIST: Albert Hofmann, chemist, died on April 29th, aged 102
The Northern Lights happen when incoming solar radiation hits the earth's upper atmosphere and excites atoms to a new energy state, emitting colours which is energy in the form of light.
He started with the small quatrefoil lights of the Holy Spirit and the crucifixion, proceeding down through the main panels of Christ and his followers on the mountain, with all the way the white shaft of God's transfiguring light growing broader through the fire-and-storm colours of the glass.
The free Who Is It app customises this functionality further, so the light blinks in one of three colours for up to three different people.
And the sky is blue, it says, because the sun produces white light which is made up of all the colours of the rainbow.
In addition, there is a spectrograph that will slice light into its component colours so scientists can discern something of the chemistry of far-flung phenomena.
It consists of 40 upright metal poles, which are supposed to light up in different colours at night.
To remedy this problem, Kylie Catchpole of the Australian National University in Canberra and Albert Polman of the Institute for Atomic and Molecular Physics in Amsterdam have been trying to redirect the light that falls onto the surface of a cell in such a way that all colours are efficiently absorbed.
When working, it splits light into its component colours, to reveal information about the chemical content, temperature and motion of planets, comets, stars, interstellar gas and galaxies.
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