https://apnews.com/3e79b2fb6e2042b284544e8ecd3cd81e

FLAGSTAFF, Ariz. (AP) — A telescope array atop Anderson Mesa in northern Arizona is getting a major upgrade more than 20 years after it was built.

The massive "Y'' shape of the Navy Optical Precision Interferometer stretches across the equivalent of four football fields southeast of Flagstaff, the Arizona Daily Sun reported .