• Register
PhysicsOverflow is a next-generation academic platform for physicists and astronomers, including a community peer review system and a postgraduate-level discussion forum analogous to MathOverflow.

Welcome to PhysicsOverflow! PhysicsOverflow is an open platform for community peer review and graduate-level Physics discussion.

Please help promote PhysicsOverflow ads elsewhere if you like it.


PO is now at the Physics Department of Bielefeld University!

New printer friendly PO pages!

Migration to Bielefeld University was successful!

Please vote for this year's PhysicsOverflow ads!

Please do help out in categorising submissions. Submit a paper to PhysicsOverflow!

... see more

Tools for paper authors

Submit paper
Claim Paper Authorship

Tools for SE users

Search User
Reclaim SE Account
Request Account Merger
Nativise imported posts
Claim post (deleted users)
Import SE post

Users whose questions have been imported from Physics Stack Exchange, Theoretical Physics Stack Exchange, or any other Stack Exchange site are kindly requested to reclaim their account and not to register as a new user.

Public \(\beta\) tools

Report a bug with a feature
Request a new functionality
404 page design
Send feedback


(propose a free ad)

Site Statistics

205 submissions , 163 unreviewed
5,075 questions , 2,226 unanswered
5,347 answers , 22,743 comments
1,470 users with positive rep
818 active unimported users
More ...

  Probability of moving object to leave a circular system in relation to starting position and direction.

+ 0 like - 0 dislike

Lets say that there is a spaceship traveling with constant speed V for a specific duration T. The spaceship is inside a 'round' solar system with a radious R.


The spaceship can start moving anywhere inside the solar system, and move in whatever direction (uniform distribution). What is the average probability that it gets out of the solar system? This should be expressed in relation to R,V,T.

How can we solve this problem?


Closed as per community consensus as the post is not graduate-level
asked Dec 2, 2018 in Closed Questions by anonymous [ no revision ]
recategorized Dec 4, 2018 by Dilaton

not graduate+ level. Users with 500+ reputation may vote here to close. 
PhysicsOverflow is a site for advanced physics. Please ask elementary 
questions on other online platforms that value such questions. 

user contributions licensed under cc by-sa 3.0 with attribution required

Your rights