By Ian Morison
Delivering an in-depth figuring out either for common readers and astronomy fans, this hugely finished ebook offers an up to date survey of our wisdom of the Universe past Earth. The publication explores our sunlight procedure, its planets and different our bodies; examines the sunlight and the way it and different stars evolve via their lifetimes; discusses the hunt for planets past our sun procedure and the way we'd realize lifestyles on them; and highlights fascinating items came upon inside of our galaxy, the Milky method. It additionally appears at our present realizing of the foundation and evolution of the Universe, in addition to many different fascinating themes, akin to time, black holes and Einstein's theories, darkish subject, darkish strength and the Cosmic Microwave historical past. The e-book is uniquely supported by means of video lectures given via the writer, to be had on-line. it is usually the very most recent astronomical observations, equivalent to these made by means of the Planck and Kepler spacecraft.
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Additional info for A Journey through the Universe: Gresham Lectures on Astronomy
The Sun: A Biography by David Whitehouse (John Wiley & Sons). 25 3 Aspects of our Solar System How do we know that, given a suitably large bowl, Saturn could float? This chapter (which is not based on a Gresham lecture) will look at our own Solar System as an example of solar systems in general and how astronomers have been able to measure the sizes and masses of the planets – so we can calculate their density and thus discover that Saturn would float in water. It will discuss aspects of planetary orbits, how the Sun’s radiation and the properties of the planets determine their surface temperatures, and how atmospheres form and change during the lifetime of a planet.
As the Moon’s relative mass and size is comparable to that of the Earth, the two are sometimes thought of as a ‘double planet’. The name ‘Earth’ derives from the Anglo-Saxon word ‘erda’ meaning ground or soil. This became ‘eorthe’ in Old English and ‘erthe’ in Middle English. Finally, from around 1400, the name ‘Earth’ was used – the only planetary name not derived from Greek and Roman mythology. Out-gassing from volcanoes produced Earth’s secondary atmosphere and water vapour condensed to form the oceans, with additional water provided by the impact of comets.
Interference with short-wave radio communication can also occur, and the interaction of the entrained magnetic field with electricity power transmission cables can cause problems and the possible shutdown of electricity grids – as happened in the Quebec province of Canada in March 1989. 6). They are most often seen within a band centred on the north and south magnetic poles and are known as the Aurora Borealis and Aurora Australis respectively. ) The Aurora Borealis is often called the northern lights, as it tends to be seen as a green or reddish glow in the northern sky.