Links:
[1] http://admin.indiaenvironmentportal.org.in/news/30-yr-old-youngest-nearby-black-hole-found
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/astronomy
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nasa
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/physical-science