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.
I'm Jonathan Evans.
1. arrive at 抵达，到达
When do we arrive at Hongkong?
2. more than 超过，多于
That would be more than I have expected.
3. attempt to do sth 企图做某事
The police balked the attempt to kidnap the child.
4. make sure 确信，确保
Make sure you know which is which.
5.The asteroid is named Ryugu after an undersea palace in a Japanese folktale. Ryugu is about 900 meters wide.
name... after... 以……命名
The Wau Holland Foundation is named after Herwart Holland-Moritz, also known as Wau Holland.
The G-spot is named after Dr. Ernst Grafenberg, a gynecologist known for his research on female genitalia.
6. It will create a crater on the asteroid's surface collecting pieces of rock to bring back to Earth.
bring... to... 将……带到……
In England, your food is brought to you on your own plate.
When a person is brought to an American court, he is presumed innocent until proven guilty.
一年半后，该探测器将进行三次短距着陆，以收集岩石 。如果任务成功，那么这颗小行星上的岩石可能会提供有关太阳系起源以及地球生命的信息 。
隼鸟2号将在近两个月的时间里寻找小行星粗糙表面的安全着陆点 。由于该小行星表面温度极高，所以每次着陆只能待几秒 。隼鸟2号收集的岩石将会通过重返容器在2020年之前返回地球 。
这颗小行星名为龙宫，是以日本一则民间故事的海底宫殿命名的 。龙宫宽度近900米 。
从宇宙航空研究开发机构发布的照片中可以看出，这颗小行星看起来比较方，而且可以看到许多大型火山口 。项目经理津田雄一在一则博客中描述了自己对这颗小行星的看法 。他表示，由于小行星表面凹凸不平，所以着陆点的选择就兼具趣味性和难度了 。
首次着陆定于9月或10月 。最后一次着陆定于4月或5月 。在最后一次着陆之前，隼鸟2号将发射一个装置，用以探测该小行星表面 。隼鸟2号还将以高速发射一个重达2公斤的铜制物体到该小行星来制造弹坑 。
此外，还需要两到三周的时间来确认会导致隼鸟2号损坏的残骸是否已经消除 。然后，隼鸟2号将试图着陆在弹坑里或弹坑附近，以收集因爆炸产生的地下或地表物质 。
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