A study on the relative astronomical benefits of different sizes of telescopes found that while papers based on HST data generate 15 times as many citations as a 4 m ground-based telescope such as the William Herschel Telescope, the HST costs about 100 times as much to build and maintain.Deciding between building ground- versus space-based telescopes is complex.. 
Mamman Bello Ali (1958 – 27 January, 2009) je oloselu omo ile Naijiria ati gomina ipinle Yobe lati odun 2007 titi de 27 January, 2009 nigba to di alaisi.. 