© NASA/JPL-Caltech/UCLAComet Sliding Spring, a visitor from the Oort Cloud, was captured by WISE in Jan. 2010.
A century of comet data suggests a dark, Jupiter-sized object is lurking at the solar system's outer edge and hurling chunks of ice and dust toward Earth.
"We've accumulated 10 years more data, double the comets we viewed to test this hypothesis," said planetary scientist
John Matese of the University of Louisiana. "Only now should we be able to falsify or verify that you could have a Jupiter-mass object out there."
In 1999, Matese and colleague
Daniel Whitmire suggested the sun has a hidden companion that boots icy bodies from the
Oort Cloud, a spherical haze of comets at the solar system's fringes, into the inner solar system where we can see them.
In a new analysis of observations dating back to 1898, Matese and Whitmire confirm their first thought: In this area 20 percent of the comets visible from Earth were sent by a dark, distant planet.
This thought was a reaction to an earlier notion that a dim brown dwarf or red dwarf star, ominously dubbed
Nemesis, has pummeled the Earth with deadly comet showers every 30 million years or so. Shortly research suggested that mass extinctions on Earth don't line up with Nemesis's predictions, so many astronomers now reckon the object doesn't exist.