The mysterious light was visible in the Kolkata sky on Thursday evening for about five minutes.
Apart from Kolkata, the strange light was visible from Bankura, East, and West Midnapore, North and South 24 Parganas, Howrah, Hooghly, and also from a few districts in Odisha.
The light was seen moving and it was like a spotlight.
If experts are to be believed, it can be a part of a missile, satellite, or meteorite.