Hints: Mars Earth haystack microbe

They are the organisms also that live in the extremes. They can live in the very high temperature and very high acid and very high salt. They define the limits of life and the potential of life. But hunting for microbes would not be easy. Mars is 6,700 kilometers wide and it has the same landmass as Earth. Microbes, on the other hand, are tiny. You could fit nearly ten million on just your fingertip. It would be far harder than finding a needle in a haystack. Scientists had to narrow down their search. So they looked for the one thing that had to be present for life to form: a place where you could find microbes. The search for life is the search for liquid water. Life on Earth is basically full of water. Life forms are basically little bags of water with little a, a few other ingredients added. But water is the main component. Water is what makes it work. On Earth, all life is based on water. It's the main constituent of every cell. Because water is basically inert, it's the perfect medium for different types of molecule to flow around, meet and react together. It enables life to form.

这篇材料你能听出多少？点击这里做听写，提高外语水平>>