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The Voyager I spacecraft is the most distant man-made object in the universe. It was launched in 1977 and as in 2002, it was more than 8 billions miles from the Earth.


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ozone layer Meteor.
A layer of the Earth's atmosphere in which most of the atmosphere's ozone concentration is found. It is located in the stratosphere, 10-50 km above the Earth's surface. Ozone (O3) plays an important part in absorbing harmful ultraviolet (UV) radiation from the Sun. Consequently, a rise in temperature prevent vertical mixing so that it forms a stable layer in stratosphere. Depletion of such layer is thought to be due to human activities such as release of CFC man-made gases that destroy ozone. This may cause an increase in UV exposure to living organisms on Earth and an increase in skin diseases and cancer on human.

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