英语听力：自然百科 穿越银河系的旅行 Through Milky Way—35

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A trillion planets and an unimaginable large number but what is the chances of any of them being  in a location where life could flourish.

We can expand the idea of a habitable zone around the star to a habitable zone within our entire Milky¹ Way galaxy². On our journey around the Milky Way, we would learn to a great deal to help in the search for a galactic zone, a safe heaven for life. 

In close at the harbour, there is extraordinary many of X-rays, harsh radio waves even gama rays, that would certainly destroy fragile single cell life, just getting start toward evolution.

Downtown this dangerous, there is super massive life hold on their //that also has bad things to happen. There are also a lot of stars around there . You know, There are a lot of stars sound good. But on the other hand, if you have too many nearby stars, they can be // all the commit in the solar system. They constantly commutating with these pollutions that just as the Venus source, are not only good for you. 

Safe neighbourhood maybe found in the spiral larms, but here too is all about location. If you have been on the planets in a super nova that explosion can boo you whole again, like my get started and then you know, another couple of hundred million years later get white down, so this area of resource with no goals on, on mans land,well, no alliance on perhaps,

The outer reaches of our Milky Way a quieter, but even here life would find it difficult to evolve.

At the out girds of our Milky Way galaxy are there very many elements of which the cells of our bodies n life we know are composed and so we may not have the essential building blocks of  life at the outer edges of our Milky Way. 

So it's no accident that we are where we are, our neighbourhood talk too way to spiral larms is the perfect habitable zone because it remain relatively³ unchanged for billions  of years, giving life, time to establish and evolve, other advanced civilizations if they exist unlikely to living in a similar neighbourhood. Kokoon for the dangerous of the galaxy. We have yet to find them of course but the galaxies⁴ is a big place. 

We haven't found any life elsewhere. We haven;t found any dead pounds anywhere, not convincingly. And why is that, well, fewer in thousand stars get carefully for a planets that have intelligent life. You know it's her way to going to Africa. They are looking for a Mega Forna you know, element. And you learnt  Africa and you look the first square yard of a real state and there is no elephants here and you give up, well,you shouldn't give up. We are just beginning.

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