Giant Stealth Planet May Explain Rain of Comets from Solar System's Edge

"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)."

See:

http://news.yahoo.com/s/space/201012...rs ystemsedge