71. Earth in Danger

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.