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What makes a spiral galaxy, well, spiral? And how long does it take them to get in a spin?
![](http://static.ddmcdn.com/gif/recipes/planet-dead-stars-200-131227.jpg)
Astronomers have spotted signs of a possible exoplanet in a
nearby system of twin failed stars. If confirmed, the alien world would
be one of the closest to our sun ever found.
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