“It was probably the runt of the family,” Scott Sheppard tells the L.A. Times of the theorized ninth planet. Sheppard's 2014 co-discovery of the planetoid 2012 VP113, popularly nicknamed "Biden," spurred new interest in the possibility of Planet X from another team of researchers, who produced a groundbreaking paper on it this year. More

Scientific Area: 
Reference to Person: 
News Topic: 
Earth/Planetary Science