1. The cloud of rocks and dust that surrounds our solar systems. The Oort cloud is believed to contain long-period comets.
2. The Oort cloud is the source of long-period comets and possibly higher-inclination intermediate comets that were pulled into shorter period orbits by the planets, such as Halley and Swift-Tuttle. Comets can also shift their orbits due to jets of gas and dust that rocket from their icy surface as they approach the sun. Although they get off course, comets do have initial orbits with widely different ranges, from 200 years to once every million years or more. Comets entering the planetary region for the first time, come from an average distance of 44,000 astronomical units.
3. The Oorts cloud is a sphere shaped cloud where a lot of longer orbit comets get their start. It is 5 to 8 trillion kilometers from the sun.
4. The cloud surrounds the planetary system and is aprox extends 3 lightyears from the sun.
5. The mass of the cloud is about 40 times that of Earth
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