Is Planet Nine Pulling Us Closer?

It's not time to update the posters, rulers, books, felt sets, lollipops, and mnemonics just yet, but astronomer Michael Brown anticipates that it will be by the end of next winter. Planet Nine, a predicted gas giant orbiting the sun far beyond Neptune, explains so many mysteries of the solar system, he says, that's it's hard to believe it doesn't exist. The latest of these is the curious case of the six-degree tilt of the sun. This is an artist's conception of the  distant view from Planet Nin...