You have a projectile which just moves ballistically.

有一个弹道运动的射弹。

It would be a massive explosion, with chunks of molten material flying around the Earth ballistically, re-entering the Earth's atmosphere and causing massive meteor showers everywhere.

将产生巨大的爆炸高温而融化的片从地面飞起冲进大气层造成巨大的片雨。