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Week 6: Planets galore: the contents of the Milky Way

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An artist’s impression of a potentially rocky planet orbiting the M dwarf star Gliese 667 C. Like the nearest star to the Sun, Proxima Centauri, Gliese 667 C is part of a triple-star system. The other two stars in the system are visible in the planet’s sky.

 8.3  Radial velocity searches for small worlds