Their total area is about 250 times that of the earth.
Spaceships will not be able to land on some of the
but that still leaves to be explored
and area ten times as great as the continents of the earth.
Exploring space may seem terrifying to some people.
No doubt explorers of the past were terrified by the great empty oceans that lay before them.
They conquered their fears crossed the oceans,and built the New World.
In the past when explorers set sail into the unknown
they had to say good-bye to all they knew at home.
Space explorers will not face such great loneliness.
Ever when they travel far beyond the sun
they will be able to send messages back.
18. When will be an age of exploration?
19. How did the explorers of the past feel when the great empty oceans lay before them?
20. What is this passage about?
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