From Learning English, this is Science in the News.
Im Anna Matteo.
And Im Christopher Cruise.
Today we report on recent developments in space science. We tell about the growing demand for communications satellites and space-based imaging services. We also tell about Chinas first robotic vehicle on the moon. But first, we examine the effect of longer space flights on humans.
How Do Long Periods in Space Affect the Body and Mind?
Human beings have a natural desire to explore the unknown. People with a strong interest in space like to say it is the last place left to explore. But scientists are warning that space exploration for long periods is not going to be easy. They say the human body is not designed to stay in space over an extended period.
The New York Times recently published a report about scientists who are preparing astronauts for a trip to the Moon. The newspaper said the scientists want to make sure that their crews return home in good health. But there are many problems to be solved before people are ready for long trips to the Moon, an asteroid or even the planet Mars.
Humans developed on a planet with a surface that is more than 70 percent water. Our bodies are also about 70 percent water. When there is no gravity that water moves up toward the head, raising pressure in the skull. Arms and legs grow weaker at what is called zero gravity because they no longer need to push against the force of gravity.
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