o https://www.youtube.com/watch?v=sNhhvQGsMEc
o https://www.youtube.com/watch?v=bfS7FrN5aNQ
o https://www.cnn.com/2015/01/20/us/feat-air-force-ufo-project-blue- book/index.html
o https://alien-ufo-research.com/history-of-ufo-sightings-timeline/
o https://alien-ufo-research.com/aurora-texas-ufo-crash/
o https://arxiv.org/ftp/arxiv/papers/1105/1105.0910.pdf
o https://cdn.discordapp.com/attachments/706285813855682590/741812765827661934/screenshot501.jpg
o https://cdn.discordapp.com/attachments/706285813855682590/741812771972448317/screenshot541.jpg
o https://cdn.discordapp.com/attachments/706285813855682590/741812774031720557/screenshot542.png
o https://www.youtube.com/watch?v=1fQkVqno-uI
o https://www.youtube.com/watch?v=UjtOGPJ0URM
o https://en.wikipedia.org/wiki/Extraterrestrial_life#Cosmic_pluralism
o https://en.wikipedia.org/wiki/The_War_of_the_Worlds
o https://en.wikipedia.org/wiki/Search_for_extraterrestrial_intelligence
o https://en.wikipedia.org/wiki/Active_SETI
o https://en.wikipedia.org/wiki/Arecibo_message
o https://en.wikipedia.org/wiki/A_Simple_Response_to_an_Elemental_Message
o https://arxiv.org/ftp/arxiv/papers/1105/1105.0910.pdf
o https://en.wikipedia.org/wiki/Drake_equation
o https://en.wikipedia.org/wiki/Kardashev_scale
o https://en.wikipedia.org/wiki/Fermi_paradox
o https://en.wikipedia.org/wiki/Area_51#UFO_and_other_conspiracy_theories
o http://www.cplire.ru/html/ra&sr/irm/CosmicCall-2003/index.html
o http://www.spaceref.com/news/viewpr.html?pid=12140