Webb telescope captures colorful Cartwheel Galaxy

The James Webb Space Telescope has peered through time and huge amounts of dust to capture a new image of the Cartwheel Galaxy, revealing the spinning ring of color in unprecedented clarity, NASA and the European Space Agency ...

Planet 9 is running out of places to hide

We have a pretty good idea of what lurks within our solar system. We know there isn't a Mars-sized planet orbiting between Jupiter and Saturn, nor a brown dwarf nemesis heading our way. Anything large and fairly close to ...

Intracellular nanothermometer has unprecedented versatility

Body temperature is a basic indicator of health. Intracellular temperature is also a basic indicator of cellular health; cancer cells are more metabolically active, and thus can have a slightly higher temperature than healthy ...

New imaging method reveals concealed objects

A new way of imaging concealed objects, devised by a researcher at the National Institute of Standards and Technology (NIST) and his colleagues, might take all the fun out of hide-and-seek, but could also help save lives.

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Infrared

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 (~30,000 µm). Infrared radiation spans roughly three orders of magnitude (750 nm and 100 µm).

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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