- Do all stars have an Oort cloud or is it a rare occurence?
Oort-cloud objects are 2,000 - 50,000 (or more) AU away-- so these objects, to us in the same solar system, have an apparent magnitude much fainter than 11 The point of that poorly-explained interlude is that these objects are faint Very faint And objects in Oort Clouds around other stars would appear even fainter
- Do other stars have Oort clouds? - Astronomy Stack Exchange
If we use our Oort cloud as a model, and, warning, these estimates are enormously ballpark, but, a trillion Oort cloud objects 1 KM or larger and the Oort cloud extends between 100,000 and 200,000 AU (lets say 150,000 as a middle estimate), that works out to one 1 KM or larger object per cubic region of space about 15 AU across That's 3 4ths
- What are the relative distances between objects in the Oort cloud?
The Oort Cloud has many more objects than the main asteroid belt, some trillion objects larger than a kilometer, but it also occupies a much larger volume of space from 5,000 AU to beyond 20,000 to 50,000 AU from the Sun Oort Cloud objects larger than 1 km have some 31 million miles (50 million km) between each other
- orbit - Why didnt passing stars destroy the Oort cloud? - Astronomy . . .
$\begingroup$ Yes, it will perturb those objects, but the passing star will pass, and the Oort cloud comets will (for the most part) settle back into a slow elliptical orbit around the sun A few get knocked into the inner solar system, and a few get ejected - now I haven't done any particular simulations of this, but the fact that we still see
- Outer Limit of Oort Cloud - Astronomy Stack Exchange
Naturally those close passages will perturb the orbits of many Oort Cloud objects, and tend to free them from orbiting the Sun and put them orbits around the galactic center parallel to the Sun's orbit There is also the question of the Sun's Hill spear or Hill radius relative to the galactic center
- Why do comets come from our local Oort cloud instead of from . . .
But why are they ejected to form specifically a local Oort cloud instead of going interstellar and becoming vagabonds? Per multiple models, most comets did become vagabonds Estimates vary, but the lowest I've seen is 65% being ejected, and some estimate that well over 90% were ejected Moreover, comets in the Oort cloud are ejected as well
- How is it possible that we havent discovered anything in the Oort . . .
The Oort cloud is a hypothetical cloud of small icy bodies surrounding the Sun at more than 1000 AU It is thought to be a vast reservoir of comets that occasionally get disrupted, sending comets towards the inner solar system
- Whats the reason for the hollow region in Oort cloud?
The Oort cloud itself is thought to be mainly populated with objects that formed in the inner Solar System, where the protostellar disc was dense Small asteroids that are close to the giant planets can pick up a series of orbital perturbations that boost their eccentricity and semi-major axis, whilst keeping their perihelion distance roughly
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