What caused a mysterious atmospheric explosion in Siberia in 1908?

On June 30, 1908, a significant and unprecedented atmospheric explosion took place above the remote region of Siberia. The event was characterized by a fire erupting in the sky during the morning hours. This singular occurrence has been described as unmatched by any subsequent similar events observed throughout modern history. Scientists have investigated this phenomenon extensively, but its precise cause remains unknown. Despite decades of research, no definitive explanation for the Siberian explosion has yet emerged, continuing to intrigue experts worldwide.