Civilizations From Oldest Stars Had Enough Time To Reach Earth If They Wanted To: Researchers.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/are-humans-alone-or-are-aliens-avoiding-us
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/science-and-technology
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cfcs
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/atmosphere-and-ozone-layer
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nasa
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone