By Mark A. Garlick
ISBN-10: 0521803365
ISBN-13: 9780521803366
The our bodies of our sun approach have orbited continously round the sunlight in view that their formation, yet they've got now not consistently been there, and stipulations haven't consistently been as they're this day. the tale of the sunlight procedure explains how our sunlight procedure got here into life, the way it has advanced and the way it may well finish billions of years from now. After a quick ancient advent, Mark Garlick describes the beginning of the sunlight and the stairs that equipped up the our bodies of the sunlight process. brilliant illustrations of planets, moons, asteroids and comets supplement the distinct descriptions. A comparability of those gadgets, and an research of ways they've got replaced and advanced due to the fact that start is via a glance in the direction of the top of the sun System's lifestyles. Mark A. Garlick received his PhD in astrophysics from the Mullard house technology Laboratory in Surrey, England. he's a member of the foreign organization of Astronomical Artists, and presently works as a contract technological know-how author and astronomical illustrator.
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Extra info for Garlick. The Story of the Solar System
Sample text
The secondary atmospheres were in place within several hundred million years of the formation of the planets, while they were still sustaining heavy bombardment. As a result of that bombardment, lightweight Mars ultimately lost 99 per cent of its original secondary atmosphere, which was blasted away into space. And neither Mercury nor the Moon could retain their secondary atmospheres because they did not have sufficient gravity to hold on to even the slow-moving, heavy gases. Over time, all of the planets’ atmospheres have evolved.
Ten million years had passed. But there was a long way to go. Closer to the Sun, the planet-building factory was still in full swing. There, playing catch-up, the terrestrial planets were emerging. 10–100 million years Terrestrial Planets The terrestrial planets were latecomers. Because ices could not condense near the Sun, the materials (rock and metal) from which these planets coalesced were a lot less abundant than those that formed the giants further out. So, while the gas planets had formed within a million years – or at most a few million years – and the ice giants took maybe ten million years, for the terrestrials the formation process was even longer.
Close to the protosun, where the temperature was around 2000 Celsius, only the very densest materials, such as iron, could condense. So the grains that grew there had a significant iron content. A bit further out, where it was cooler, silicate particles condensed into grains of rock. And at about 5 AU from the centre, the current location of the planet Jupiter, ices began to gather. Here, at what astronomers call the ‘snow line’, the Solar Nebula was a lot colder – maybe less than Ϫ70 Celsius. It was here and beyond where the water, ammonia and methane finally condensed out and froze to form ice crystals.
Garlick. The Story of the Solar System by Mark A. Garlick
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