The earth upon which we live is one of the known planets that circle
the sun. In ancient times men who studied the stars noticed that while
certain heavenly bodies seemed fixed in the sky, others seemed to
move about. The latter they named as planets or wanderers.
Modern astronomers tell us that the four planets, Jupiter, Saturn,
Uranus and Neptune, which are much bigger than the others, are
surrounded by poisonous gases and are so cold that any living thing
attempting to land on them would immediately be frozen to death.
Of the remaining planets, Venus most closely resembles the earth in
size, but it is a world devoid of moisture, swept unceasingly by
storms and lacking in its atmosphere the life-giving oxygen by which
all life is made possible on its nearest neighbor in space the Earth.
Mars is the only planet on which there is sign of life. Most of mars is
desert but there are green areas on its surface, which change
according to the seasons, suggesting that some form of plant life is
possible. It is known that the surface temperature of Mercury, the
hottest and nearest planet to the sun is sufficient to melt lead.
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Earth is one of eight planets that circle the star we call the sun. Together, the sun, the planets, and smaller objects such as moons make up our solar system. The four planets closest to the sun—Mercury, Venus, Earth, and Mars—are called terrestrial planets.
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