![](http://www.ecns.cn/hd/2021/03/30/ff28d11a941a43cc97caad896edbbde7.jpg)
Staff members work at the control room of China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) in southwest China's Guizhou Province, March 27, 2021. FAST has identified over 300 pulsars so far. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, it officially began operating on Jan. 11, 2020. (Xinhua/Ou Dongqu)
![](http://www.ecns.cn/hd/2021/03/30/88cc6fc1fbc14c3fa18f632467e344f7.jpg)
A staff member works at the control room of China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) in southwest China's Guizhou Province, March 27, 2021. FAST has identified over 300 pulsars so far. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, it officially began operating on Jan. 11, 2020. (Xinhua/Ou Dongqu)
![](http://www.ecns.cn/hd/2021/03/30/5fbbc21fb5034155b82d30d7f9d63226.jpg)
Photo taken on March 28, 2021 shows China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) under maintenance in southwest China's Guizhou Province. FAST has identified over 300 pulsars so far. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, it officially began operating on Jan. 11, 2020. (Xinhua/Ou Dongqu)
![](http://www.ecns.cn/hd/2021/03/30/67cc8358e1624c68ab4adfd7688aef18.jpg)
Aerial photo taken on March 28, 2021 shows China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) under maintenance in southwest China's Guizhou Province. FAST has identified over 300 pulsars so far. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, it officially began operating on Jan. 11, 2020. (Xinhua/Ou Dongqu)
![](http://www.ecns.cn/hd/2021/03/30/6bd9cec4dc1242edb8ff1e7e3e4c36ce.jpg)
Aerial panoramic photo taken on March 28, 2021 shows China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) under maintenance in southwest China's Guizhou Province. FAST has identified over 300 pulsars so far. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, it officially began operating on Jan. 11, 2020. (Xinhua/Ou Dongqu)
![](http://www.ecns.cn/hd/2021/03/30/38bc2543b941474182b17ad13cbcad76.jpg)
Photo taken on March 29, 2021 shows China's Five-hundred-meter Aperture Spherical radio Telescope (FAST) under maintenance in southwest China's Guizhou Province. FAST has identified over 300 pulsars so far. Located in a naturally deep and round karst depression in southwest China's Guizhou Province, it officially began operating on Jan. 11, 2020. (Xinhua/Ou Dongqu)