The article says that such planets have been observed previously, but only indirectly. I found an article about those previous discoveries: http://arstechnica.c

The article says that such planets have been observed previously, but only indirectly. I found an article about those previous discoveries: http://arstechnica.com/science/2011/05/exoplanets-without-a-star-galaxy-teems-with-lonely-jupiters/ http://arstechnica.com/science/2011/05/exoplanets-without-a-...