I don't know if science is getting any closer to the truth, but science is always ruling out things that don't conform to the truth.
In the last century, for example, astronomers measured the speed at which various parts of the Milky Way were orbiting and found predictions that did not fit with general relativity.
There are two possibilities for this phenomenon: 1. There are undetected masses of matter that add up to much more than ordinary galactic matter, and their gravitational effects create anomalies in the speed at which galaxies orbit. These things are called dark matter, and it's a commonly accepted hypothesis -- because there's a lot of other evidence for the existence of a broad phase on a cosmic scale.
Until now, astronomers and astrophysicists have not directly detected dark matter. This is just a hypothetical model. We don't know if this is any closer to the truth. But we know that it must be wrong to say that only ordinary observable matter in a galaxy is completely true.