newly discovered planet 4,000 light years away

A newly discovered planet 4,000 light years away is to dense for scientist.  Dubbed CoRoT-20b, the planet is thought to be a gas giant about four-fifths the size of Jupiter and orbits close to a sun like star. Despite the new planet's size, this world has four times Jupiter's mass! That poses a problem for astronomers: If CoRoT-20b is structured like a traditional gas giant, with a solid core surrounded by a gassy atmosphere, the planet's core would have to make up 50 to 77 percent of the world's total mass. By contrast, Jupiter's core is thought to represent just 15 percent of that planet's mass. To have such a robust core, CoRoT-20b would defy current theories for how planets form. The team considered whether CoRoT-20b could have been much bigger originally, and perhaps its lighter elements had been stripped away by its parent star.