underwater photography of great white sharks, dolphins, divers and other marine life by Stephen Brunson
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Images of Rare Solar Eclipses and Sunsets from around the world
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The sun, by the gravitational effects of its mass, dominates the planetary system that includes the earth      During its first 50 million years, the sun contracted to approximately its present size. Gravitational energy released by the collapsing gas heated the interior, and when the core was hot enough, the contraction ceased and the nuclear burning of hydrogen into helium began in the core. The sun has been in this stage of its life for about 4.5 billion years      By the radiation of its electromagnetic energy, the sun furnishes all of the energy supporting all life on earth      all foods and all fuels are derived ultimately from plants using the energy of sunlight, photosynthesis      The total amount of energy emitted by the sun in the form of radiation is remarkably constant, varying by no more than a few tenths of 1 percent over several days

energy output is generated deep within the sun      Like most stars, the sun is made up primarily of hydrogen (specifically, 71% hydrogen, 27% helium, and 2% other elements)      Near the center of the sun the temperature is almost 29,000,000 degrees Fahrenheit and the density is 150 times that of water      the nuclei of individual hydrogen atoms in the sun interact, undergoing nuclear fusion      two hydrogen nuclei combine to make one helium nucleus, and energy is released in the form of gamma radiation from the sun

The gamma radiation energy from the sun is equivalent to that which would be released from the explosion of 100 billion one-megaton hydrogen bombs per second      The nuclear burning of hydrogen in the core of the sun extends out to about 25 percent of the sun's radius      Because of its proximity to the earth, and because it is such a typical star, the sun is a unique resource for the study of stellar phenomena      The star closest to the sun is located approximately 4.3 lightyears away. To observe features on it's surface of comparable size to those that can be seen routinely on the sun would require a telescope more than 18 miles in diameter      The sun, by the gravitational effects of its mass, dominates the planetary system that includes the earth

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