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Arrange the following sentences to make a well-organized essay.  Each chunk of sentences is one paragraph.  The sentences within each paragraph are out of order, and the paragraphs are out of order. 

 _____ After too many minutes without oxygen, a person would lose consciousness and eventually die.

_____ One of the challenges that is unique to space is the fact that space is a vacuum, which is a risk for various reasons.

_____ First, in a vacuum there is no atmosphere and therefore no air pressure.

_____ With current technology, the dangers of the outer space vacuum are too overwhelming for prolonged space travel. 

_____ Finally, without an atmosphere, the rays of the Sun can cause radiation poisoning.  

_____ Also, in a vacuum a person's blood will gradually begin to boil.

_____ Without air pressure, the human body has no oxygen to sustain itself.


 _____ Finally, the lack of water in space means that human life may have a difficult time surviving on other planets.

_____ In addition, meteors can threaten human life and

damage spacecraft.

_____ As one can see, the challenges of space travel are

rather different from terrestrial dangers.

_____ There are other difficulties involved with space

exploration, but these are three of the most important ones.

_____ In summary, without adequate air pressure, the

unprotected human body may be seriously harmed in a vacuum.


 _____ Under the Earth's blanket of air, people are usually protected from meteor impacts.

_____ These are pieces of rock and metal that are left over from the formation of the solar system.

_____ It is true that the chance of meteor impacts is relatively small, but if even a small micrometeor happens to collide with a spacecraft, it could cause serious damage.

_____ However, in space, people and spaceships are vulnerable to collisions with meteors.

_____ Another difficulty that is unique to outer space is the presence of meteors and micrometeors.

_____ Many of these objects travel at very high speeds.


 _____ For example, when primitive humans left their tribal villages to search for food and water, they risked death or injury from dangerous animals.

_____ Throughout human history, the physical universe has often presented dangers to explorers.

_____ Similarly, the ocean of outer space has many dangers.

_____ However, it also has several unique challenges for explorers including its vacuum environment, countless high-speed meteors, and few known sources of water. 

_____ Later, when people sailed the oceans in search of new lands for settlement or trade, many died in terrible storms.


 _____ This planet is likewise too hot for water to exist.

_____ A similar situation exists on the planet Venus, second from the Sun.

 _____ A third special challenge involved with the environment of space involves the fact that it is very difficult to find life-sustaining water off the Earth.

_____ For example, the planet Mercury, which is closest to the Sun, is too hot to have water, so space travelers must take water from Earth if they want to visit Mercury.

_____ Although astronauts are able to recycle their own waste into drinkable water, the fact that no additional usable water exists in our solar system makes long-distance space travel very risky.

_____ Similarly, the fourth planet, Mars, is too cold and dry, although there may be some water frozen at the north and south poles of the planet.