"We may have lost Pluto, but it looks like we might be getting Tyche. Scientists may soon be able to prove the existence of the gas giant, which could be four times the size of Jupiter, according to astrophysicists John Matese and Daniel Whitmire from the University of Louisiana at Lafayette."
For those following this topic, this apparently is the new name of the G1.9 Brown Dwarf Star that Spanish Astronomers claimed the discovery of last summer (see post here:
http://t.co/shYC8Fk ).
And it's apparently not a new discovery (NASA P/R again ?) since this article dated last April already mentioned the whole Nemesis/Tyche story:
http://bit.ly/cVXSOsPer Wikipedia, "The use of the name "Tyche" for the planet may also be a reference to an earlier theory of the Solar System's structure that involved the Sun having a dim companion named Nemesis as it was proposed as a cause for mass-extinctions on Earth. Tyche was the name of the sister of Nemesis."
http://bit.ly/es1eE5