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There are two definitions of the Oort limit:
- the outer boundary of the Oort cloud. The current estimate is about 100,000 astronomical units (15 trillion km, or 1.5 lightyears) from the Sun, which is approximately 1/3 of the distance to the nearest star (Alpha Centauri).
- the estimate of the local density of matter (mass per unit volume) in the Sun's vicinity.