Abstract
Many physicists have repeatedly turned to general relativity(GR) for the feasibility of faster than light astronautic travel, bypassing the difficulties caused by special relativity (SR). This article argues that this should not and need not be done. Because SR's "ban" on faster than light motion is wrong. We think that the idea of relying on GR to achieve faster than light travel is not desirable, because as a theoretical system, GR's internal logic is chaotic and causality is reversed. Einstein's equation of gravitational field (EGFE) is the most important formula in GR, but EGFE has obvious assumptions and traces of patchwork. How to get to "gravity bends spacetime"(or "spacetime bending makes gravity") is a fundamental question. The physical effect of the gravitational field is determined to be embodied by the metric tensor of Riemann space, and it is necessary to know the distribution law of the metric field. However, in the absence of actual observational knowledge, EGFE is derived by speculative reasoning. That is, physics experiments have never provided the knowledge and laws that show the geometry of gravity that only Riemann geometry can show. Therefore, the spacetime bending of GR is not a reassuringly reliable theory.
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