為什麼俄羅斯隕石在空中爆炸?

when the store attracted by the Earth, the friction between the Earth and the store will burn it up.

so if the size of the store is larger enough, the time of burning will be longer.

撞到地面才爆炸 because of the big size
在空中爆炸 the size is not enough to burn until it down to the ground

因為隕石在空中摩擦!

一般隕石在撞到地面是會爆炸，俄羅斯的隕石他可能在空中燃燒時分裂是燃燒到裏面的燃燒物或爆炸物，所以導致空中爆炸。