Four years ago, NASA struck him. Now Hera will investigate him.

In September 2022, NASA's DART spacecraft collided with the moon Dimorphos, altering its orbit and ejecting debris into space. ESA's Hera spacecraft is now observing Dimorphos and Didymos from about 25-30 kilometers away, with plans to get closer. Hera aims to study the impact's effects on Dimorphos's surface and structure, including its mass and composition. The mission will also investigate Didymos, which rotates rapidly, potentially affecting material movement on its surface. Hera will conduct detailed observations and deploy two small satellites for close-up studies and potential landing attempts.