BTA-6
...that after spending fifteen years building the largest telescope in the world, scientists in the Soviet Union were dismayed to find that BTA-6 performed much worse than the Hale telescope it was designed to beat? 
...that after spending fifteen years building the largest telescope in the world, scientists in the <a href="./Soviet_Union" id="mwFh4" rel="mw:WikiLink" title="Soviet Union">Soviet Union</a> were dismayed to find that <b id="mwFh8"><a href="./BTA-6" id="mwFiA" rel="mw:WikiLink" title="BTA-6">BTA-6</a></b> performed much worse than the <a class="mw-redirect" href="./Hale_telescope" id="mwFiE" rel="mw:WikiLink" title="Hale telescope">Hale telescope</a> it was designed to beat? <div about="#mwt36" class="" data-mw='{"parts":[{"template":{"target":{"wt":"-","href":"./Template:-"},"params":{},"i":0}}]}' id="mwFiI" style="clear:both;" typeof="mw:Transclusion"></div>