Craters here sctreches as far as the eye can see.

If you're walking on the surface of Mercury,you will look a lot like a moon,I will see.

When you step onto the Mercury, you step into the world with no real atmosphere, with the sky is the black its night and blaze in sunshine.

And where drive is all through track at least three billion year old battle field.

Big craters, small craters, craters are everywhere, so that's your first impression looking at.

Like the moon,Mercury took most of the battery early on,a silent witness to dawn of the time, each been undisturbed by single drop of rain or breath of wind ever sense.

For the most part,the surface of Mercury has been frozen in time for period of years.you may say that's boring, but that's necessarily to good thing, because this planet is such as Mercury as a moon perserve accurately for what's going on during this critical early period of our information, we can basically start it at there, because there's land on the surface.

Every stone of crater in this portmark world have potential to gaze back four and half billion years.

But counting these craters is just first challenge when we come to review the planet like Mercury.

It's always lower in horizon so it's hard to get point telescope from Mercury, it's hard to get in orbit around Mercury, because so close the sun.

For that reason, Mercury remains one of most under explored planets in our solar system.

注：听力文本来源于普特