Ian Ridpath's Astronomy (Eyewitness Companions) PDF

By Ian Ridpath

ISBN-10: 1405312912

ISBN-13: 9781405312912

Exhibiting you what others purely let you know, this identify is helping you find the historical past and origins of the universe and become aware of the celebrities and galaxies, with over a hundred superstar charts and profiles of all 88 constellations. together with a month-by-month advisor to highlights of the evening sky, it's excellent for any fanatic, and is the definitive visible advisor to having fun with and appreciating astronomy.

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Extra resources for Astronomy (Eyewitness Companions)

Example text

Until recently, there was no way to tell what they were – though some astronomers guessed correctly that they were stars like the Sun. 22–23). Today astronomers are able to explain nearly all the phenomena they observe in stars as aspects of a single model of stellar evolution. he stars are nebulae and supernova remnants are the glowing material flung off by stars during events late in their lifetimes. galaxies and clusTers Our galaxy, the Milky Way, is made up of 200 billion or more stars, their associated gas and dust clouds, and the planetary systems that orbit many of them.

For the first 10-43 seconds, the socalled “Planck Time”, the normal laws of physics did not apply. the StARt Of time The first 10-35 seconds of time saw the sudden burst of inflation, accompanied by a dramatic drop in pressure and temperature, and a resurgence of temperature as Inflation came to a halt. Diameter 10-26m / 3x10-26ft 10m / 33ft 105m (100km / 62 miles) Temp. 1027K (1,000 trillion trillion ˚C / 1,800 trillion trillion ˚F) Time A 100-billionth of a yoctosecond / 10-35 secs 1022K (10 billion trillion ˚C / 18 billion trillion ˚F) A 100-millionth of a yoctosecond / 10-32 seconds quark quark singularity at the start of time 1 yoctosecond / 10-24 seconds quark antiquark quarkantiquark pair X-boson infLAtiOn And the SePARAtiOn Of f ORCeS Inflation – a brief period of sudden expansion in the first instant of creation, during which the Universe grew from smaller than an atom to bigger than a galaxy – is needed to explain the uniformity of the Universe as it appears today.

Above a certain weight, known as the Chandrasekhar limit, the forces between the particles in the star would not be able to resist gravity, and the stellar remnant would collapse to an even denser state, a neutron star. 67) in 1967. And even neutron stars proved to have an upper limit, above which their particles would dissolve into even tinier quarks and they would collapse to form black holes. Stephen hawking Best known for his book A Brief History of Time, Stephen Hawking did much of his groundbreaking work in the 1960s and 1970s on the structure of black holes.

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Astronomy (Eyewitness Companions) by Ian Ridpath

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