Now, there are dozens of science fiction magazines instead of a few, so many in fact that the half dozen year's best editors claim they can't read everything printed. (bidinotto.com)
The acceptance rate for most professional science fiction magazines (for short fiction) is generally below 1 %. (massgenomics.org)
In fact, in the high peak of science fiction magazines, there were often only one or two writers per issue, even though the magazine showed six or seven authors. (deanwesleysmith.com)