On the other hand , in the lecture , the absence of a crater in Tunguska demands atmosphere .
On the other hand , in the lecture , the absence of a crater in Tunguska demands atmosphere . On the other hand , in the lecture , the absence of a crater in Tunguska demands atmosphere . On the other hand , in the lecture , the absence of a crater in Tunguska demands atmosphere . On the other hand , in the lecture , the absence of a crater in Tunguska was due to the atmosphere .