pdalek
21-01-2016, 05:02 AM
Gravitational signature hints at massive object that orbits the Sun every 20,000 years.
http://www.nature.com/news/evidence-grows-for-giant-planet-on-fringes-of-solar-system-1.19182
Research paper
http://iopscience.iop.org/article/10.3847/0004-6256/151/2/22/pdf
http://www.nature.com/news/evidence-grows-for-giant-planet-on-fringes-of-solar-system-1.19182
Research paper
http://iopscience.iop.org/article/10.3847/0004-6256/151/2/22/pdf