HINTS： 

reconnaissance of Mars

Earth 

100 billion galaxies

cosmos is brimming

In this, our first cosmic voyage we have just begun the reconnaissance of Mars and all those other planets and stars and galaxies. In voyages to come, we will explore them more fully. But now we travel the few remaining light minutes to a blue and cloudy world, third from the sun. The end of our long journey is the world where we began. Our travels allow us to see the Earth anew as if we came from somewhere else. There are 100 billion galaxies and a billion trillion stars. Why should this modest planet be the only inhabited world? To me, it seems far more likely that the cosmos is brimming over with life and intelligence. But so far, every living thing, every conscious being, every civilization we know anything about lived there on Earth.

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