NEW YORK — The largest digital camera ever built is starting to capture images of unseen corners of the universe. The Vera C. Rubin Observatory has officially begun its cosmic survey, meant to capture swathes of the sky in more depth and detail. Perched on a Chilean mountaintop, the telescope will point its eye at the southern sky for the next 10 years, taking hundreds of images per night. Researchers hope Rubin’s observations will help them take a better census of the universe, mapping