School Policy on Wikipedia: Read for background but do not cite!
Rule No. 1: Use Wikipedia as a starting point for your research, but don't cite it unless you can exhaustively demonstrate that is is the only authoritative source on a particular issue.
Rule No. 2: Re: Rule No. 1: That doesn't mean that you should use the information from Wikipedia anyway and just not cite it. It means that you should find other research sources. Encyclopedias are only meant as starting points! For example, you could find the bibliography in the Wikipedia article and look at the sources that the author of the article used. You could also look to see if there is a list of links. Check those out as well.
Rule No. 3: If you are unsure, ask your teacher or librarian!
A site search is a focused search that only looks at a specific website or type of website. This type of search can be very useful when you are trying to find information from a specific domain (Harvard, Amazon, etc...), type of website (.edu, .gov, etc...), or to search for information on a specific website (www.mass.gov, www.apa.org, etc...).
Using the site operator in google you can search the contents of one specific website for information. In this project it would be useful to be able to search the NASA website for information on space technology. You will need to know the website URL for NASA and the key words you want to use in your search:
NASA’s URL is: nasa.gov
Try these results for [site:nasa.gov space technology]