The clouds seemed to be conspiring against Jimo Pereira last summer. The university student from Buenos Aires spent much of her time curled up in a sleeping bag on the grounds of Eichsfelder Hütte, a hostel deep in Germany’s rugged Harz Mountains. Night after chilly night she’d be out in the open field with her project partner, trying to stay warm. Every so often one of them would get up to check their telescope, but the clouds stubbornly barred their view. Then one night, finally, they saw stars. For hours,…