The Silence and I wrote:I thought the sensors couldn't see the Pegasis anyway, they could only tell it was in there because of some residual warp core signature or something. If so, then how could Data's instruments tell him there were gravitic fluctuations at all? Heh, maybie the subspace signature from the Pegasis' core created a side effect that looked like gravitic fluctuations. It should have been obvious there were no dangerous fluctuations, but the crew has encountered strange things before, so maybie he felt it was possible and didn't question the sensors.
The ship's sensors were obviously wrong. Or perhaps Data is a moron, or perhaps both. He's not exactly known to be infallible; he was off by a whole order of magnitude on a surface area calculation for the Dyson sphere.
I agree with Aleska, the crew should have at least some idea what they are seeing, but at the same time what they report is often stupid, impossible, contrary to what's observed, etc. However, it should be noted that the Feds are capable of "impossible" things, for example- Their transporters rely upon their Heisenberg Compensators, and Phasers appear to violate Conservation of Baryons, yet this is accepted technology in their world. Even things like "instantanious supernova" or subspace itself, or Warp drive or certainly the probability alterating device on DS9 are impossible. This is not an excuse to fall back upon, but impossible things do happen.
Performing impossible feats and observing impossible phenomena are two totally different things. The latter can be rationalized with technology. The former is composed of things which simply
cannot occur in nature. It's like finding a stable element with a greater atomic number of 300 or so (which they did in one episode). It's just impossible because the element would have too much potential energy and fission to produce two lighter nuclei.
Data's idiotic claim of gravitational fluctuations generates certain predictions that we can test. If the fluctuations are large enough to disrupt the guidance system of a shuttle, then the asteroid should be rotating around random axes and randomly changing shape, and the fissure the Enterprise entered through could not exist. If there were any gravitational fluctuations, they were utterly minuscule. So, we can conclude one of three things:
Data is a moron who can't read sensors, or
the sensors are simply wrong or
Federation shuttlecraft are incapable of dealing with extremely small changes in acceleration.
Take your pick.