Washington: Astronomers claim to have found evidence that suggest a planet four times the size of Earth may be skirting the edges of the solar system beyond Pluto.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/astronomers-find-proof-unseen-planet-beyond-pluto
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/astronomy
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/research-agencies
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer