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Oort Cloud

In a distance of 300 - 100 000 AU there are still objects belonging to our solar system. The spheric Oort Cloud, which can be seen as the outest frontier of our solar system, stretches 1.5 light-years into space.

Probably the cloud contains asteroids and comets in all sizes. Disturbances caused by the graviation of near stars can throw objects inwards, like the long periodic comets.

Supposedly the Oort Cloud is an early remnant from the forming of the solar system. By the way its existance still isn't proofed directly, but counts as sure.

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    Oort Cloud
Graphic: Nasa

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