deletions | additions       diff --git a/The_next_question_I_needed__.tex b/The_next_question_I_needed__.tex  index 270c867..80c30a0 100644  --- a/The_next_question_I_needed__.tex  +++ b/The_next_question_I_needed__.tex 
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The next question I needed to answer was which radial velocity along the line of nodes I should use to calculate the orbital velocity. To find the mass of the whole galaxy, you need to find the mass enclosed in the orbit. In other words, you need to take the velocity of the point on the line of nodes at the very end becauseall of  the mass stars orbit that is most toward the outside  of the galaxy will be found because the furthest point on the line of nodes encloses all enclose  the most  mass. We can do this because the mass enclosed affects the orbit of the final point stars  on the line of nodes, so the whole mass of the galaxy affects the very last end  point on the end line  of nodes. In order to find the radial velocity at that point, you need to take the velocity of the last value on the line of nodes and subtract the velocity from the center point in order to find the true radial velocity. That means, I did: