What we want to know is how organic molecules actually form in comets and whether they helped deliver organic material to the Earth before life began.

We believe materials coming out of comets now is the same material that went into comets 4.5 billion years ago.

This is what we looked like 4.5 billion years ago. Comets haven't changed since then.

We'll be able to say some things almost instantly. One of the big questions is do comets contain minerals that contain water, called hydrated silicates and under an electron microscope you can identify those practically instantly.

About 10 per cent of this comet is made of organic materials. We don't know exactly what they all are but it is very exciting.

Comets do blow up unexpectedly,