Clouds in Cygnus

2012-11_CygnusHPd_2k
APOD image credit and description

With this beautiful image I also wanted to share a top class article by Carlo Rovelli on the subject of loop quantum gravity.
fig5
Skipping from Faraday via Feynman, the essentials of this idea are grasped through conceptual discussion, to arrive at an alternative to string theory. Loop quantum gravity predicts that spacetime is made up of elementary grains of volume at the Planck scale. Numerical simulations (left) reveal how such discrete quantum geometries “evolve” into smooth classical space. The article appeared in Physics World November 2003.

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