... Science User Portal . ... ESO, the European Southern Observatory . ... ESO . ... Survey Telescopes . ... A survey of peer-reviewed scientific papers published in 2015 and using data from ESOтАЩs telescopes and instruments has shown that ESO remains the worldтАЩs most productive ground-based observatory. ... Nevertheless, it is clear that ESO continues to significantly surpass any other ground-based observatory and on the available figures remains slightly ahead of the NASA/ESA Hubble Space Telescope...