科学技术类搜索引擎及目录索引

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航天科学 Space：

Aerospace Navigator - Directory of aerospace and astronomy resources.

Brian's Space Hotlist - Directory of links to quality space information intelligently organized into a number of topics, and annotations make it clear what each site listed is about.

Cosmiverse - The online portal for space and science enthusiasts. Devoted to space, science, science fiction, and the paranormal. Provides original, targeted news; chat rooms; message boards; a game room; and dozens of other portal features.

Galaxy Page, The - Database of space and astronomy-related web sites.

Space and Flight Launch Pad - Directory of space exploration, astronomy, and aviation resources.

Space Today Online - Space directory. Covers space from Earth to the edge of the universe.

SpaceRef - Space directory and search engine. Includes space exploration and missions, a space calendar of events, and interactive space news.