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With the discovery of three additional planets that lie outside the solar system, astronomers have now found evidence of more than 50 extrasolar planets.
Each of the newly discovered systems features a star roughly similar to the sun and a bizarre entourage of planets and possibly a failed star that may provide fresh insight into planet formation.
New studies challenge the notion that supermassive black holes finished growing soon after their host galaxies formed and suggest new ways to find these black holes and measure their mass.
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