Re: [asa] Near Starlight Problem; Adam would never see all of Orion's belt?

> All the stars are moving around the center of the Galaxy in exactly in
> accordance with the general gravitational field of the Galaxy, aside from
> modifications of stars in star clusters.

I dont know about the Milky Way, but this isnt true for all other galaxies.
John D. Anderson (of JPL) writes in Astronomy, March 2009:

"Since the 1970's astronomers have known that the outer regions of
galaxies appear to violate Newton's gravity laws. We would expect the
stars in a galaxy's outer regions to travel in elliptical orbit's with
their orbital speeds decreasing with increasing distance. However,
this is not observed. Instead of decreasing, the speeds are
essentially constant over a wide region of the galaxy."

"Astronomers hypothesized that the galxies actually contain large
quantities of unseen material that hold the stars in the galaxy. This
extra mass -- called dark matter because it interacts via the
gravitational force while remaining impossible to to directly observe
-- brings the dynamics into agreement with Newton."

Anderson's article is called "Is there something we don't know about
gravity" and he points out that the Pioneer spacecraft which are now
headed out of the solar system are off course by up to 32,000 miles.
He references Physical Review Letters, March 7, 2008, where he and
four other JPL scientists discuss whats wrong with the theory of
gravity.
Six spacecraft which have done flybys of the earth for gravity boost
are accelerating at the wrong rate. He suggests that a new theory of
gravity may be needed.

We still live in exciting times! Dark matter may disappear.

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Received on Fri Feb 20 16:45:44 2009