A single faint infrared source, detected first in 1983 and then again between 2006 and 2007, has emerged as the strongest candidate yet for the hypothetical Planet Nine. Researchers cross-matched two ...

Add Yahoo as a preferred source to see more of our stories on Google. Pluto's 2006 status change from planet to dwarf planet is still a sore subject for many, including a fourth grader in Tampa, ...