Until 2005, Arizona Space Observatory has discovered 64 sure lensing systems that have multiple blueprint per each. As well as 18 more possible lensing systems were found.
Lensing is an important part of the study of today's astrophysicist studies. In 1983, the conference was held in Liège, France with first gravitational lensing. Since then, there are similar scientific conferences in different places in the world every year. Lansing is no longer limited to any theoretical subject, but it is used in the real and experimental research of cosmology and astronomy. It is now a powerful tool for the study of space observation, blacksmith, big bang model etc.
References
https://en.wikipedia.org/wiki/Gravitational_lens
http://www.livescience.com/11064-space-time-distortions-uncover-hidden-galaxies.html
http://w.astro.berkeley.edu/~jcohn/lens.html
http://csep10.phys.utk.edu/astr162/lect/galaxies/lensing.html
http://www.livescience.com/23341-farthest-galaxy-discovery-gravitational-lens.html
http://www.scientificamerican.com/podcast/episode/cosmic-gravitational-lensing-reveal-10-11-05/
http://relativity.livingreviews.org/Articles/lrr-1998-12/download/lrr-1998-12BW.pdf
http://relativity.livingreviews.org/Articles/lrr-1998-12/download/lrr-1998-12BW.pdf
Apurba this universe, AM Harun or Rashid and Farsim Mannan Mohammadi, Prathama Prakashan.
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