The Guardian has an article talking about the mysterious progress of the oldest human space probes, Pioneer 10 and 11. The question is, “Is there dark matter or is the the universal law of gravitation wrong?” I think dark matter is bullshit like the theory of ether. Though I’m sure there is matter that does not reflect light back to the Earth. The fallibility of the law of gravitation has a recurrent pattern like the law of gravitational acceleration before relativity was accepted.
It is issues like these that should push us to throw probes as far out as possible to give us a sort of stereoscopic view of the universe. Perhaps, observatories or simple measurement devices designed to have an operational lifespan of 30 years. These simple devices may be able to answer physics questions by direct evidence instead of Earth based observation and complex analysis. No matter how detailed the analysis, a cyclops has only one eye and no depth perception.