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DSST Astronomy

# It was isaac who formulated the basic laws of modern

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It was Isaac ____________ who formulated the basic laws of modern mechanics and showed them to be universal throughout the solar system, applying to the motions of the celestial objects as well as to objects on the Earth. Detailed Explanation: Newton. His greatest contributions in the fields of astronomy, mechanics, optics, and mathematics were conceived by the time he had reached the age of 24.

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Newton is also often credited with developing the next big development in telescopes in 1668 (about sixty years after Galileo's first telescope), the ______________ telescope. Explanation: Reflecting. The reflecting telescope (also called a newtonian telescope) uses a curved mirror instead of a lens. Netwon's development of the use of mirrors instead of lenses opened the door to development of telescopes of millions of times magnification--far beyond what could ever be achieved with a lens. Newton's entire system is based on three laws of ____________. Explanation: Motion. These three laws are: 1. In the absence of outside forces, the momentum of a system remains constant. 2. If a force acts upon a body, the body accelerates in the direction of the force, its momentum changing at a rate numerically equal to that force. 3. Forces are always mutual, thus if a force is exerted upon a body, that body reacts with an equal and opposite force upon whatever exerts the force upon it. In 1905, Albert Einstein published a paper in which he outlined his theory of ______________. Explanation: Relativity. Einstein's theory was based on two postulates: 1. There is no absolute reference system with which we can measure absolute motions in space. The best we can hope to measure is the relative motion of one object with respect to another. 2. The speed of light, with respect to all observers, is always the same. The equatorial circumference of the Earth is ____________ statute miles. Explanation: 24,900. The Earth is not quite perfectly spherical. Along the Earth's equator one degree is about 60 nautical miles and a nautical mile is 1.1516 statute miles. The formula for figuring the circumference is 360 (degrees in a circle) x 60 (nautical miles in a degree) x 1.1516 (nautical miles in a statute mile). The study of stresses that build up gradually in the crust of the Earth and cause earthquakes is called ______________. Detailed Explanation: Seismology. Energy is often released by slippages along fissures or faults resulting in earthquakes. Some of these vibrations travel along the surface and others pass directly through the interior of the Earth. Seismology is studied through the use of instruments that pick up vibrations and record the activity. The ______________ increases about one degree Celsius for every one hundred feet you go downward into the crust of the Earth. Explanation:
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It was Isaac who formulated the basic laws of modern...

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