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nebula: Definition and Much More from Answers.com (1739 words) |
 | Nebulae are now distinguished from star clouds that can be resolved into individual stars, but earlier workers were unable to differentiate between white nebulae, which are stellar systems so remote as to show no individual stars, and gaseous or diffuse nebulae in the Milky Way Galaxy. |
 | Dark nebulae are detected as empty patches in a field of stars or as dark clouds obscuring part of a bright nebula in the background, as in the case of the Horsehead Nebula. |
 | Other nebulae are formed by the death of stars; a star that undergoes the transition to a white dwarf blows off its outer layer to form a planetary nebula. |
| Wikinfo | Nebula Award (502 words) |
 | The Nebula is an award given each year by the Science Fiction and Fantasy Writers of America (SFWA), for the best science fiction stories published in the United States during the two previous years. |
 | In addition, a Nebula has been awarded for best dramatic script every year since 1999, but SFWA membership is divided about the appropriateness of the award, and the category may not continue long into the future. |
 | Nebula Awards is a registered trademark of the Science Fiction and Fantasy Writers of America. |