Seeing is believing. But seeing a huge rock half the size of Earth smash into Jupiter in July 1996 was incredible. Can you imagine what would happen if Earth collided with a huge space rock? It would be disastrous. In fact, it is thought that a meteor killed the dinosaurs millions of years ago.
A rock like the one that hit Jupiter could split Earth in two. Doing nothing about it is like waiting for the end of the world. So scientists plan to start a project to identify all space rocks that could hit Earth.
眼见为实, 但目睹一颗有地球一半大的巨大石块在公元一九九六年七月撞向木星却令人无法置信。你能够想象地球如果撞上太空中的一颗巨大石块会怎么样吗？那后果将不堪设想。事实上, 有人认为在数百万年前就是一块陨石造成所有的恐龙灭绝。