A Japanese spacecraft arrived at an asteroid Wednesday after traveling for more than three years.
The Hayabusa2 spacecraft is to perform a new experiment.It will create a crater on the asteroid's surface collecting pieces of rock to bring back to Earth.
Japan Aerospace Exploration Agency(JAXA)said the Hayabusa2 is about 20 kilometers from the asteroid which is orbiting the sun 280 million kilometers from Earth.
Over the next year and a half,the robotic explorer will attempt three short landings to gather rocks.If they are successful,the asteroid material could provide information about the beginning of the solar system and possibly life on Earth.
Space officials say however that the mission will be difficult.
Hayabusa2 will spend about two months looking for safe landing places on the rough surface.Because of the high surface temperature,it will stay for only a few seconds each time it lands.Any rocks it collects would be sent back in a re-entry container expected to arrive at the end of 2020.
The asteroid is named Ryugu after an undersea palace in a Japanese folktale.Ryugu is about 900 meters wide.
In photographs released by JAXA,the Japanese space agency,the asteroid appears to be more square-shaped than round.A number of large craters can be seen.Project Manager Yuichi Tsuda described the asteroid in an online post.He said the rough surface will make choosing landing places"both interesting and difficult."
The first landing is planned for September or October.The final landing is planned for April or May.Before the final landing,Hayabusa2 will send out a device that will explode above the asteroid.It will shoot a two-kilogram copper object into the asteroid at high speed to create a crater.
Hayabusa2 will reposition itself on the other side of the asteroid to protect itself during the operation.
It will take another two to three weeks to make sure any wreckage that could damage the explorer has cleared.Hayabusa2 will then attempt to land at or near the crater to collect underground or surface material that was blown out by the explosion.