Download PDF by Ian Ridpath: Astronomy (Eyewitness Companions)

By Ian Ridpath

ISBN-10: 1405312912

ISBN-13: 9781405312912

Displaying you what others in simple terms inform you, this identify is helping you find the historical past and origins of the universe and notice the celebrities and galaxies, with over a hundred megastar charts and profiles of all 88 constellations. together with a month-by-month consultant to highlights of the evening sky, it really is excellent for any fanatic, and is the definitive visible advisor to having fun with and appreciating astronomy.

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It is now estimated that the sun and stars like it have a sufficient mass of hydrogen to keep shining for about 10 billion years. the hydrogen chain The hydrogen or proton-proton chain that produces energy in the cores of Sun-like stars involves a sequence of reactions in which hydrogen nuclei (protons) fuse with each other and then undergo radioactive decay to eventually produce a helium nucleus (two protons and two neutrons). mass lost in the reaction is converted into energy in accordance with equation E=mc2 neutrino gamma-ray photon helium nucleus neutron hydrogen nucleus (proton) When two protons collide, one changes into a neutron, releasing a positron and a neutrino positron another proton fuses with the proton-neutron pair, releasing a gamma-ray photon the two groups collide, forming a helium nucleus and releasing two protons over the limit The Crab Nebula supernova remnant shows “ripples” caused by the rapidly rotating neutron star (pulsar) at its heart.

Even before this, President Kennedy had announced the next leg of the race, vowing that America would put a man on the Moon by the end of the decade. this new challenge was to push both sides to the limit. America launched the new two-man Gemini programme, which would rehearse many of the techniques needed for a successful lunar mission. the soviets, meanwhile, suffered a series of setbacks that eventually pushed them out of the race altogether. t h E r Ac E to t h E Mo o n saturn v Still the most powerful launch vehicle ever built, the Saturn V stood 110m (360ft) tall and used three stages to propel the Apollo spacecraft towards the Moon.

Improved measurements suggest that this force may be increasing over time, and has only overcome the general deceleration in the past 6 billion years. its presence seems to indicate that the Universe will expand forever, but if its strength is increasing, it could have more drastic effects. cold death In the "Big Chill" scenario, all galaxies will merge to form giant ellipticals like NGC 1316 (left). Star formation will end, and eventually the last stars will go out. Over trillions of years, even the matter within them will disintegrate.

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Astronomy (Eyewitness Companions) by Ian Ridpath


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