Nsryjdtyk

5 $begingroup$ Around 100 million years ago, the Solar System was instantaneously encased in a massless, magical sphere centered about the Sun. The boundary is about 10,000 AU (.158 ly) in radius and behaves abnormally: matter and energy from outside the boundary may enter into the Solar System unaffected, while matter and energy trying to exit is essentially erased (if you were to reach your hand beyond the boundary, you'd retract a gory stump). Question: Assuming that everything else proceeded as usual with the dinosaurs' extinction and humanity's uprising... With such a structure just thrown up like that in the distant past, could there be any astronomically glaring signs or repercussions of it that would tip us (present-day "modern" astronomers with our space telescopes and space probes)