网络梯子是什么意思

We are going to ask you to fill an interactive form that is intended to be easy to fill out for anyone.Please, be as precise as you can. Your report is important, it alerts us to potentially scientifically significant events that occur, and contributes to the general database of knowledge about meteors.You will have the opportunity to give us all the details about your sighting experience at the end of the form.

Please, don't report sighting that lasted more than 30 seconds: the vast majority of fireballs are only visible for few seconds.
Please, don't report recurring events: seeing a fireball is extremely rare and often an once in a lifetime event.
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