* Astronomy

From Christian Science Monitor:

"In addition, they discovered that the largest known asteroid, Ceres, is probably a failed planet. It is not just a glob of rock. It is almost perfectly round, suggesting that it has a rocky core separated from an outer crust - like Earth. Only Jupiter's disruptive gravity prevented Ceres from accumulating more mass and becoming a planet."

Is this true?

Was Ceres actually a planet?
Thank you.