Related topics: infrared light · black holes · radio waves

Gamma-ray blazars in the sky

When the supermassive black holes at the center of galaxies accrete material, they can eject powerful jets of charged particles at speeds approaching that of light. These particles in turn emit radiation across the electromagnetic ...

Hyperspectral content for cameras

New software developed by Ben-Gurion University of the Negev (BGU) researchers will enable standard cameras and smartphones to capture both hyperspectral images and video with a faster and more cost-efficient approach than ...

Graphene single photon detectors

Considerable interest in new single-photon detector technologies has been scaling in this past decade. Nowadays, quantum optics and quantum information applications are, among others, one of the main precursors for the accelerated ...

Designing sensors to detect foreign bodies in food

Researchers at the NUP/UPNA-Public University of Navarre and the Navarre-based company Anteral S.L. have designed a novel system of sensors to improve quality control in the food sector and based on terahertz technology. ...

Setting sun on space station solar research

Today, ground control in Belgium switched off a package that had been continuously watching the Sun from the International Space Station for nine years.

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Electromagnetic spectrum

The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.

The electromagnetic spectrum extends from below frequencies used for modern radio through to gamma radiation at the short-wavelength end, covering wavelengths from thousands of kilometers down to a fraction of the size of an atom. The long wavelength limit is the size of the universe itself, while it is thought that the short wavelength limit is in the vicinity of the Planck length, although in principle the spectrum is infinite and continuous.

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