Re: stellar orbits in galaxies

pausch@xxxxxxx (Paul Schlyter) writes:

So, as regards perpendicular motion, it's kind of like someone drilled a
hole through the Earth and dropped a ball into the hole. Is there any force
that tends to attenuate the bounces? If so, when might we expect the ball
to stop bouncing?

In the case of a ball falling through a hole drilled through the Earth:
the friction against the air would soon stop the ball bouncing - it wouldn't
even bounce once --- at least not very far. Even a human falling through air
in our atmosphere will soon reach an equilibrium speed where the air
resistance equals his weight - that equilibrium speed is approximately
200 km/h.

I'm sorry, I expressed that very badly again. Having made the analogy between
the Sun and the ball, all subsequent statements and questions about "the ball"
actually were meant to refer to the Sun. In other words, is there anything
attenuating the bobbing motion of the Sun?
--
Ignorantly,
Allan Adler <ara@xxxxxxxxxxxxxxxxxxxx>
* Disclaimer: I am a guest and *not* a member of the MIT CSAIL. My actions and
* comments do not reflect in any way on MIT. Also, I am nowhere near Boston.
.

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