Download Cosmic Dawn: The Search for the First Stars and Galaxies by George Rhee PDF

By George Rhee

The noticeable universe involves stars and galaxies. one of many demanding situations of astronomy is to appreciate how galaxies and stars first got here into lifestyles over 13 billion years in the past. This e-book tells the tale of our quest to unravel this challenge. 400 years after Galileo used his telescope to find the moons of Jupiter, we're utilizing new telescopes and tools to look for the 1st galaxies to shape after the massive Bang. This ebook brings the reader to the present frontier of this topic and lays out a number of the fascinating advancements we will be able to anticipate within the years yet to come.

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Extra resources for Cosmic Dawn: The Search for the First Stars and Galaxies (Astronomers' Universe)

Example text

Even more intriguing is the fact that the version of the paper which was published in English with the help of Arthur Eddington in 1931 does not contain the estimates of the Hubble constant from the 1927 paper. One can use Hubble’s constant to get an estimate of the age of the universe. Hubble’s estimate of his constant was about ten times too big, implying an age of the Universe of 2 billion years–rather discomforting, given that the oldest rocks on Earth were believed to be about 4 billion years old.

The first and third car are now separated by a distance of 20 miles after 1 h. In another hour, their separation will have grown to 40 miles. By looking at the cars 1 h after the race started and working back in time, we can conclude that they all left the starting line at the same time. Since galaxies obey Hubble’s law, we can draw the same conclusion. In the past, the galaxies were all closer together, and, in the future, they will be farther apart. We thus encounter one fundamental property of the universe: it is evolving.

Tools provided by developments in technology are essential to this process. The discovery that planets move on elliptical orbits was dependent on the measurements made with Tycho’s precision instruments. Galileo’s telescope increased light gathering power and the amount of detail that could be seen (resolving power) by a factor of ten. This enabled him to remove any doubts about the Sun centered model of the solar system. The same is true in the field of theoretical astronomy. Many of the ideas that Newton used in his theory of motion and gravitation were not original.

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