Astrophysicists: Strong evidence gigantic 'Planet X' does exist
• Terrence AymWhat's up to four times as big as Jupiter, is so distant that astronomers haven't been able to find it in more than 80 years, and is the stuff of legends and conspiracy theories? "Planet X." A mystery object that most astronomers would rather not
the flip side:
http://www.space.com/10863-mystery-planet-tyche-debate.html