The lack of recognition for female SF writers appears to be particularly acute for what's known as 'hard science fiction', i.e. science fiction that pays fairly close attention to scientific plausibility, and that seeks to break as few physical laws as possible (in an ideal universe, perhaps, none). Other subdomains of SF have a better acceptance of female authorship -- for example, Lois McMaster Bujold has made wonderful inroads into space opera with her Vorkosigan series, and it's hard to think about time-travel fiction without bringing to mind Connie Willis' books exploring the London Blitz through time travel. And yet there's still the idea around that women don't, or can't, or shouldn't write hard SF, which is a nonsense. I've started actively seeking out hard SF by female writers, and there's some tremendously good stuff there.
For a literature of the future, SF still has some fairly reactionary attitudes at times.
If you're into SF, read on.