Want to Weigh a Star? Use an Alien Planet's Moon
It’s always been tough for astronomers to weigh a star directly, but new research sketches out a good way to do it – as long as the planets (and moons) align.
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[1]: http://feedads.g.doubleclick.net/~a/8N3zmI2x7kc61XWLySBaFmeO8Ms/0/di [2]: http://feedads.g.doubleclick.net/~a/8N3zmI2x7kc61XWLySBaFmeO8Ms/0/da [3]: http://feedads.g.doubleclick.net/~a/8N3zmI2x7kc61XWLySBaFmeO8Ms/1/di [4]: http://feedads.g.doubleclick.net/~a/8N3zmI2x7kc61XWLySBaFmeO8Ms/1/da [5]: http://feeds.feedburner.com/~r/spaceheadlines/~4/Yv7hLetSwhM