The Center of the Earth
The earth’s surface is approximately 70% covered with water, which part is thus uninhabitable by man. The 30% of the earth occupied by land surfaces is not in one single land mass, but is stretched out in an odd shaped assortment of continents and islands, all of which are either inhabited or potentially habitable by man.
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Cosmic Rays, Sunspots, and Climate Change, Part 1
Sunspots are relatively cool blotches on the sun’s surface (Figure 1). The number of sunspots is an indicator of how active the sun is. It has...
Radiohalos: Nature's Tiny Mysteries
Figure 1. Some typical examples of different radiohalos found in granitic rocks, from volume 2 of the Radioisotopes and the Age of the Earth...
Jupiter's Young Moons
In 1610, Galileo Galilei aimed his telescope at Jupiter and discovered the four largest of the planet’s 95 known moons. He recognized them as...
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