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As the Earth travels around the sun, it does not hold steady in its orbit. Instead, the Earth wobbles a bit on its axis as it makes its annual trip around the sun. The wobble of the planet is caused by the effects of varying gravity from the sun and the other planets in orbit around the sun. This wobble creates variations in the typical weather patterns that exhibit on the surface of the planet. The Earth's wobble cycles about every 23,000 years. Read more: What Are the Cyclical Changes in the Earth's Orbit Causing Global Warming? | eHow.com www.ehow.com...
The fact that the Fluff is strongly magnetized means that other clouds in the galactic neighborhood could be, too. Eventually, the solar system will run into some of them, and their strong magnetic fields could compress the heliosphere even more than it is compressed now. Additional compression could allow more cosmic rays to reach the inner solar system, possibly affecting terrestrial climate and the ability of astronauts to travel safely through space. On the other hand, astronauts wouldn't have to travel so far because interstellar space would be closer than ever. These events would play out on time scales of tens to hundreds of thousands of years, which is how long it takes for the solar system to move from one cloud to the next.