The star is half the size of the Sun and there are Saturn and Jupiter look-a-likes. The planets orbit at half of the radius that Saturn and Jupiter do. Stars like OGLE-2006-BLG-109L aren't found often. Normally a star only has one planet orbiting it. Micro-lensing is the process used to find objects far away by looking at distortions in light by gravitational pulls of larger objects.
http://news.bbc.co.uk/2/hi/science/nature/7333155.stm
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