Cosmology

Download e-book for iPad: Beyond the Galaxy: How Humanity Looked Beyond Our Milky Way by Ethan Siegel

By Ethan Siegel

ISBN-10: 9814667161

ISBN-13: 9789814667166

A glance up on the evening sky unearths a treasury of wonders. Even to the bare eye, the Moon, stars, planets, the Milky means or even a couple of big name clusters and nebulae remove darkness from the heavens. For millennia, people struggled to make experience of what is available in the market within the Universe, from all we will see to that which lies past the boundaries of even our strongest telescopes. Beyond the Galaxy lines our trip from an old, Earth-centered Universe the entire technique to our glossy, twenty first century knowing of the cosmos. bearing on not just what we all know but additionally how we all know it, Ethan Siegel takes us to the very frontiers of recent astrophysics and cosmology, from the delivery of our Universe to its final destiny, and every little thing in between.

Readership: basic public attracted to astronomy, astrophysics and/or cosmology.

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Additional info for Beyond the Galaxy: How Humanity Looked Beyond Our Milky Way and Discovered the Entire Universe

Sample text

Matter was determined to be made of atoms, with those in turn made of heavy, positively charged atomic nuclei and light, negatively charged electrons orbiting them. The amount of positive charge present in an atom’s nucleus determined its identity and its physical and chemical properties, defining what type of element it was. These elements could be organized into a table, periodically, where elements within a given column displayed similarities in their bonding properties and chemical reactivity.

E. that Nicolaus Copernicus published his great work, De revolutionibus orbium coelestium (On the revolutions of the celestial spheres), that retrograde motion could successfully be explained without epicycles and deferents. Instead, the Sun would be at the center of the Solar System, and the planets — ordered Mercury, Venus, Earth, Mars, Jupiter and Saturn, moving outwards — would all orbit it, with the inner worlds moving more quickly and the outer ones moving more slowly. When an inner world, moving faster, overtook an outer world in its orbit, it would be seen to move backwards from its normal motion, causing the apparent retrograde motion (Fig.

1 The disk of the planet Uranus against a background of fixed stars. Image credit: Leo Taylor, 2010. com/. period would have to be. All the observations agreed very well with the predictions of Kepler’s laws, except for one: for the first few decades of our observations of Uranus, it appeared to be moving slightly too quickly in its orbit, meaning it swept out slightly more area than it was expected to in a given amount of time. Over the next 20 years or so, however, Uranus returned to the predicted speed, sweeping out exactly the right amount of area predicted by Kepler’s laws.

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Beyond the Galaxy: How Humanity Looked Beyond Our Milky Way and Discovered the Entire Universe by Ethan Siegel


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