... ESO, the European Southern Observatory . ... United Kingdom . ... Star Clusters . ... Last night, ESOтАЩs Wendelstein laser guide star unit had its first light at the Allg†дu Public Observatory in Ottobeuren, Germany. ... ESO has developed a concept for compact laser guide star units, whereby small powerful lasers are combined with a telescope that launches the beam, creating a single modular unit that can be mounted directly on a large telescope. ... ESO's New Compact Laser Guide Star Unit Tested ....