No. They see the lack of it. I was pretty astounded when I learned that "people who do calculations [and observations] of planetary trajectory" have known for hundreds of years that Mercury's orbit was precessing slightly more than newtonian dynamics would expect. This excess precession turns out to be something like 43 arc seconds per hundred years.
Originally Posted by EyeOnTheCode
As Ken considered, there is probably dark matter throughout the region of our solar system - as there is throughout the galaxy - but its gravitational effect within a region as small as our solar system is apparently beyond the range that we can detect - next to nothing, you might say.
I appreciate the figures. But I think the mass and configuration of the dark matter just associated with our galaxy is pretty well known. Assuming the DM is fairly evenly spread, what's the size of the galaxy+halo vs. the size of our little system here?
Originally Posted by Peter Wilson
Everyone is entitled to his own opinion, but not his own facts.