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Gravity
Something holds these balls together ...
We call this "gravity" ...
Navigation:
Ctr + arrows up/down - forward/backward,
Arrows left/rigth - left/right.
Background:
Modified image: http://www.jpl.nasa.gov/spaceimages/details.php?id=PIA12348
Courtesy NASA/JPL-Caltech
Site credits:
Copyright: 2013 (c) Konstantin Kirillov.
