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 ...

Concept could sustainably meet human resource needs of 'full Earth'

A new concept proposes to provide food, energy and water resources for the world's growing population by combining systems that simultaneously use different parts of sunlight's spectrum to produce crops, generate electricity, ...

Reshaping the solar spectrum to turn light to electricity

When it comes to installing solar cells, labor cost and the cost of the land to house them constitute the bulk of the expense. The solar cells—made often of silicon or cadmium telluride—rarely cost more than 20 percent ...

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