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a filament of gas that pushed them together in the same direction," says Murphy.
"They must not have lived their lives in a very dense environment. They are so tenuously bound together that any nearby star would have disrupted their orbit completely.
nah. parts of the Oort cloud maybe from the formation of this solar system but the whole Oort cloud is not just a ring or shell of gas ice and dust or other debris from sol system. Each of the nearby stars has contributed to it and the Oort cloud surrounds all nearby stars such as AP AC and ACB. It is likely that there are similar clouds around other more distant stars and clusters of stars. Thus the newly postulated Neptune sized planet though it may travel in the fringes of the Oort cloud (using the most liberal estimate of the inner boundary of the Oort Cloud) would not be part of the Oort Cloud.
originally posted by: swanne
a reply to: Frocharocha
Well, it's a good find, but our own solar system extends to 1.5 - 2 light-years.
The Ort Cloud
A star's gravitational field is never zero, it can get close to zero but never really reach it - that's why the bodies in the Oort Cloud still orbit the Sun even though they're over a light-year away.
originally posted by: TrueBrit
a reply to: wildespace
That depends on the type of star.
A massive star can become a black hole when it looses its grip on its structural integrity, and those things are not short of pulling power!