Chinese astronomers have switched on a device they hope will tell them more about the origins of the universe. They've begun operating the world's largest radio telescope.
It measures half a kilometer in diameter, surpassing what was the largest telescope in Puerto Rico. The construction cost about 180 million dollars and caused around 10,000 people to relocate to ensure radio silence.
Xinhua says the telescope will listen for signals from outer space. The agency says scientists from other countries will be allowed to use it after two or three years.
It's part of China's efforts to boost its space program. The country is also planning to build its own space station.
◆astronomer 天文学者
◆measure （ある数値を）示す、～の長さがある
◆outer space 宇宙空間、大気圏外、太陽系外
