Astronomers have found a gap in a disc of dust at the red dwarf star TW Hydrae.
The gap is located at about twice the distance of Neptune from the Sun.
The gap is only a strong indication of a planet, though it is far from confirmed since it have not been directly observed yet.
Yet if confirmed it might be a challenge on existing theories on how planets form. Since a planet at such a distance would take a very long time to accumulate material in its orbit around the star.
http://www.newswise.com/articles/hubble-uncovers-evidence-for-extrasolar-planet-under-construction
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