via https://ift.tt/ewui3LN A cryptic object, cloaked in the cosmos.

Invisible to the eye lies a powerful force at the center of a star metropolis.

The brilliant star cluster Messier 4, the closest such cluster to Earth at some 6,000 light-years away, contains hundreds of thousands of stars. It's a sight to see. Now, NASA has employed its legendary … NASA's dazzling photo hides a secret