Mike Brown is convinced that beyond Neptune, at the far reaches of our solar system, there's an unseen giant planet. "This is the 5th largest planet in our solar system, lurking out there ...

And these observations are giving us hints about what's going on? A new "Tatooine-like" planet outside the solar system may orbit two failed stars, scientists reported Wednesday.Related video above: ...

The AP is solely responsible for all content. A new "Tatooine-like" planet outside the solar system may orbit two failed stars, scientists reported Wednesday. Related video above: The dark energy ...