HELSINKI — China sent a classified experimental technology satellite into orbit Thursday, adding to a series of spacecraft recently sent towards geostationary orbit. A Long March 3B rocket ...

The system, called Autosat, can task, calibrate its signals and send and receive information on its own without the need for a human operator.

Satellite images help identify large areas of pollution caused by fires, dust or sand storms, volcanic eruptions, large industrial sources, or the transport of man-made pollution from other regions.

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