It was not clear as to when the scientists from ISRO would be arriving to examine the flying objects, which are now visible again in the evening and in the night. The last set was visible in the wee hours of the morning.
Intelligence agencies have opined that this could be a psychological operation of the Chinese army and a possibility of launching "Chinese lanterns" during day break and in night was looked into by various astronomers, scientists and experts who have studied glaciers for years together, the sources said.
The history of lanterns being used in battle ground dates back to third century when Zhuge Liang used this technique to seek help from his friends in fighting the enemy. The lanterns or balloons were deployed for signalling and a spy blimp.
Zhuge Liang was a chancellor of the state of Shu Han during the Three Kingdoms period of Chinese history.
Experts from Ladakh-based Indian Astronomical Observatory and other scientists then studied the phenomenon of the luminous objects and found that they disappear in 12 to 18 minutes.
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