... dated back more than two hundred years. According to Einstein's general theory of relativity, space and time together can be regarded as forming a four-dimensional space called space-time, curved by the matter and energy in it. Also according to the theory of relativity, nothing can travel faster than the speed of light but most compact objects imaginable are predicted by General Relativity to have ... such strong gravitational force that nothing can escape them- not even light. For this reason, it is called a black hole; light, as a result disappears from the visible universe. John Mit...

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• Approx Pages: 4
• Grade Level: Undergraduate

... shielding us from cosmic rays (very energetic particles generated far away in the universe) which can cause damage to living cells. The shape of the heliosphere, although never fully observed, is thought to be like a protective bubble encasing the solar system. However, it isn"t symmetrical around ... out into a tail at the back, much like a planetary magnetosphere. Recent data from the Voyager 1 and 2 space probes have shed new light on the subject. Since 1992, fifteen years after their launch for a supposed four-year flight, they have begun picking up intense low-frequency ... of inte...

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• Approx Pages: 3
• Grade Level: Undergraduate

... until technology increased to a level which would help them explore their curiosities. In the mid 1950's, The Pioneer Space Program began revealing many answers to scientists. Over time this consisted of thirteen satellite's which all possessed objectives in which some were related, and others entirely different. The Pioneer Space Program progressed through four stages: Pioneer's 1-5, Pioneers 6-9, Pioneers 10 and 11, ... their accomplishments. Through extensive travel and extreme reliability, these spacecraft revealed many answers while setting the stage for further exploration of the o...

• Word Count: 1093
• Approx Pages: 4
• Has Bibliography
• Grade Level: Undergraduate