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Perfetti P.'s A KAM theorem for infinite-dimensional discrete systems PDF

By Perfetti P.

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Planet called Gliese 581d A is the closest they ’ve found yet. Astronomers first discovered planets around the star Gliese 581 (lower right) in 2007. 41 Scientists are pretty sure they know how our solar system formed. 6 billion years ago, the Sun was surrounded by a disk of dust and gas left over from its formation. As the disk rotated, it got flatter and thinner, just as pizza dough gets flatter and thinner as a pizza maker spins it around. Particles of dust in the spinning disk stuck together and formed clumps.

The planet is seven Seven Wonders beyond the Solar System This illustration shows the planet orbiting 51 Pegasi. The planet is probably a hot ball of molten rock. 44 In this illustration, the large object at right is the planet orbiting 70 Virginis. 70 Virginis itself is the bright star at left. It shines from behind one of the planet’s moons. The Most Earthlike Extrasolar Planet times wider than Earth, but it is far too small to be a brown dwarf. It orbits very close to 51 Pegasi. 3 million miles (7 million km) away.

As a red giant enters the final stages of its life, its thin, red-glowing atmosphere begins to drift off into space. The inner core, which still contains most of the mass of the original star, slowly shrinks. As it does, it gets hotter. Eventually, most of the elements in the star turn into iron. The star can go no further than this. Fusion stops. The star is like a chunk of coal that has burned into a cinder. The star has no source of energy left to counterbalance the force of gravity. The star begins to contract rapidly.

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A KAM theorem for infinite-dimensional discrete systems by Perfetti P.


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