Infrared (IR) radiation is electromagnetic radiation whose wavelength is longer than that of visible light (400–700 nm), but shorter than that of terahertz radiation (100 µm – 1 mm) and microwaves. Infrared radiation spans more than three orders of magnitude (roughly 700 nm to 300 µm).[1]

Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux, which includes infrared (47% share of the spectrum), visible (46%), and ultra-violet (only 6%) light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.

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'Infrared' News
Farthest Galaxy Cluster Ever Detected - Wired News
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Farthest Galaxy Cluster Ever Detected

Wired News

Captured by NASA's Chandra X-ray Observatory and combined with data from infrared and optical telescopes, this image shows the farthest ...

NASA Spots Farthest Galaxy Cluster 10 Billion Light Years Away Bloomberg

Scientists identify new cluster of galaxies Independent

Galaxy group most distant ever seen CBC.ca

Belfast Telegraph  - Mirror.co.uk  - Gnews

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Google News Search: Infrared,
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