Measuring the Universe

Measuring the Universe

4.11 - 1251 ratings - Source

For the past three decades the question qhow big is the universe?q has been one of the most hotly disputed topics of modern astrophysics and cosmology. Our uncertainty about the size and age of the observable universe is no more than a reflection of our uncertainty about the distances to nearby stars and galaxies. Distance determination is not only one of the most important tasks that astronomers face, it is also one of the most difficult. Measuring the Universe begins by describing methods of measuring distances on Earth, then climbs the various qrungs of the distance ladderq that takes us all the way to an estimation of the distances of the farthest known objects in the universe. In this introductory book Stephen Webb emphasises general physical principles rather than mathematical detail. There are lots of worked examples, and each chapter ends with a helpful summary of main points, questions and problems, and a guide to further reading.As the Sun a#39;burnsa#39; its hydrogen the helium a#39;asha#39; left behind will accumulate at the centre, where most of the fusion reactions take ... At first, the temperature in this helium core will be too low to fuse helium into heavier elements. ... Stars of spectral class M occupy the rightmost part of the HR diagram, while luminous stars occupy the topmost part. ... 5.5] The birth, life and death of a main sequence star 1 07.


Title:Measuring the Universe
Author: Stephen Webb
Publisher:Springer Science & Business Media - 1999-03-18
ISBN-13:


Home | About | Privacy Policy | Contact | DMCA