SF/F Categories

The genre of science fiction and fantasy has many subcategories.

http://www.fuseliterary.com/sff-subcategories/

Worldbuilding in Science Fiction

How to create a universe for your story without using the dreaded infodump. 

http://malschmitz.hubpages.com/hub/How-to-Build-a-Universe

YA Science Fiction

If you think you aren't a science fiction person, you might want to take another look. 

http://lareviewofbooks.org/essay/yac-hit-list-young-adult-science-fiction?utm_source=Publishers+Weekly

Space Stories

It's time for science fiction stories to make a comeback. 

http://www.theguardian.com/books/booksblog/2013/aug/13/children-space-fiction-publishers-science-fiction?CMP=twt_gu

YA Publisher

Spencer Hill Press specializes in urban fantasy, sci fi, and paranormal romance for young adults. 

http://www.site.spencerhillpress.com/

New MG/YA Publisher

Month9 Books will specialize in speculative fiction for tweens and teens. 

http://www.month9books.com/

New YA Science Fiction Imprint

Prometheus Books’s Pyr imprint is starting a line of young adult science-fiction novels.

http://www.publishersweekly.com/pw/by-topic/childrens/childrens-industry-news/article/47244-pyr-to-enter-young-adult-market.html

Multicultural Science Fiction and Fantasy

Small press startup, Tu Publishng, hopes to begin accepting submissions for multicultural science fiction and fantasy is January 2010.
http://www.tupublishing.com/submission-guidelines/