A giant cluster of about 3,000 stars called Westerlund 2. The cluster resides in a raucous stellar breeding ground known as Gum 29, located 20,000 light-years away in the constellation Carina. NASA, ESA, STScI/AURA hide caption

itoggle caption NASA, ESA, STScI/AURA

You won't be able to use a robot lawn mower within 55 miles of the Robert C. Byrd Green Bank Telescope in Green Bank, W.Va., if the National Radio Astronomy Observatory has its way. Patrick Semansky/AP hide caption

itoggle caption Patrick Semansky/AP

This artist rendering shows Kepler-11, a sun-like star around which six planets orbit. A planet-hunting telescope is finding whole new worlds of possibilities in the search for alien life, including more than 50 potential planets that initially appear to be in habitable zones. The agency's chief scientist said Tuesday there will be "strong indications" of alien life within a decade. NASA/AP hide caption

itoggle caption NASA/AP