Building on this discovery, Galileo found that Io is by far the most volcanically active body in the solar system about 100 times more active than Earth.
Yet many areologists, as students of Mars are sometimes known, could not let go of the idea that the object of their affections was once an active world like the earth.
Such data provides the high resolution details from which we can see how the Earth's structures have formed, measures the exact size and shape of the volcano and provides a vital snapshot of the Earth's active and sometimes violent volcanic system in action.
The theme of the 65th anniversary issue is "Literature and the Environment, " which could seem simply trendy had the editor not been active in the very origins of Earth Day.
The need for active, purposeful management of the Earth's systems clashes with a premise on which much of modernity, including environmentalism, is founded, namely, that man stands apart from nature.
They did this by taking a peek at an astronomers' catalogue of 318 active galaxies located within 300m light years of Earth.
With over 1100 active satellites currently operating in the near-Earth environment (many of them worth hundreds of millions of dollars), and an additional 2500 inactive satellites still orbiting around our planet, the savings could be substantial.
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It requires no active cooling system and can be installed anywhere on earth, even an underground vault.
It is extremely rare on earth as it is created during very active nuclear reactions, most commonly found on the surface of the sun, but here can only be found as a by-product of the maintenance of nuclear weapons.
The source of most of the recent storms, a sunspot known as active region 9393 that is 13 times the size of Earth.
When the sun is very active, it can be thought of as pushing away cosmic rays from the Earth, reducing their incidence.
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