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There are two definitions of the Oort limit
- the outer boundary of the Oort cloud
The Oort cloud , or the Öpik–Oort cloud , is a hypothesized spherical cloud of comets which may lie roughly 50,000 AU, or nearly a light-year, from the Sun. This places the cloud at nearly a quarter of the distance to Proxima Centauri, the nearest star to the Sun...
. 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
Alpha Centauri is the brightest star in the southern constellation of Centaurus...
- the estimate of the local density of matter (mass per unit volume) in the Sun's vicinity.