Two small rovers from the Hayabusa 2 spacecraft signaled their successful landing on the asteroid Ryugu by sending images back to Earth, the Japan Aerospace Exploration Agency (JAXA) announced on Sept. 22.

The success marked the first time that rovers which can maneuver around the surface have been successfully placed on an asteroid, JAXA said.

Each of the two Minerva-II1 rovers measures 18 centimeters in diameter and 7 cm in height and weighs 1.1 kilograms.

According to JAXA, the two robots, named Rover-1A and Rover-1B, were separated from Hayabusa 2 on the afternoon of Sept. 21 at an altitude of 55 meters above Ryugu, which is about 300 million kilometers from Earth.

The two rovers dropped slowly to the surface of the asteroid at a speed of several centimeters per second. That was because they could float off into space if they landed hard due to the impact of the landing and the asteroid's weak gravitational pull.

After the successful landing, the two rovers hopped around on the surface and shot colored images. JAXA said that the two were functioning properly.

The images were sent to the Earth through Hayabusa 2, which allowed JAXA to confirm at night on Sept. 22 that the two rovers had successfully touched down.