Giant Stealth Planet May Explain Rain of Comets from Solar System's Edge - Yahoo! News

Giant Stealth Planet May Explain Rain of Comets from Solar System's Edge - Yahoo! News: "Our sun may have a companion that disturbs comets from the edge of the solar system — a giant planet with up to four times the mass of Jupiter, researchers suggest. A NASA space telescope launched last year may soon detect such a stealth companion to our sun, if it actually exists, in the distant icy realm of the comet-birthing Oort cloud, which surrounds our solar system with billions of icy objects. The potential jumbo Jupiter would likely be a world so frigid it is difficult to spot, researchers said. It could be found up to 30,000 astronomical units from the sun. One AU is the distance between the Earth and the sun, about 93 million miles (150 million km). Most systems with stars like our sun — so-called class G stars — possess companions. Only one-third are single-star systems like our solar system."