All eight planets in our solar system orbit the sun in roughly the same plane, an imaginary disk that extends from the sun's equator.

But new data show that two of the three Jupiter-like planets known to circle the sunlike star Upsilon Andromedae have orbits that are tilted 30 degrees from each other.

The orbit of the third, innermost planet is still unknown. (Find out about a batch of planets recently found outside our solar system that have tilted, "wrong way" orbits.)

The unusual discovery suggests that astronomers can't assume all star systems with multiple worlds will always