Read e-book online Astronomy. Understanding the Universe PDF

By Sherman Hollar

ISBN-10: 1615305696

ISBN-13: 9781615305698

Fathoming the boundlessness of area and the universe, we're instantly packed with interest approximately our personal origins and sweetness concerning the gadgets, existence types, and topic that populate the cosmos. during the observations and paintings of astronomers over the years, we've slowly been capable of lessen the variety of unknowns and strengthen motives or theories for a number of the celestial items and phenomena we see. This space-traveling survey recounts the various significant discovery milestones within the box of astronomy and examines the instruments and strategies presently utilized by astronomers to review the universe.

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S. astronomer Edwin Hubble announced an amazing discovery—evidence that the universe actually is expanding. In the mid-1920s astronomers had found that a class of cloudlike objects, then called spiral nebulae, are actually huge, distant groups of billions of stars, now called galaxies. Hubble’s analysis of their light showed that, with the exception of a few of the closest ones, they are all moving away from Earth, many at tremendous speeds. When Einstein realized that he had held in his hands the monumental prediction of a universe evolving through time and had then undone it with the cosmological constant, he called it the “greatest blunder” of his life.

If the planets were not acted on by some force, scientists reasoned, they would simply continue to move in a straight line past the Sun and out toward the stars. Some force must be attracting them to the Sun. The English scientist Isaac Newton calculated that in order for Kepler’s laws to have the form they do, this force must grow weaker with increasing distance from the Sun, in a particular way called an inverse square law. He also realized that the Moon’s curved path around Earth was a type of weak acceleration toward Earth.

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Astronomy. Understanding the Universe by Sherman Hollar


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