NOVA | Einstein's Big Idea | Relativity (Lightman Essay) | PBS
http://www.pbs.org/wgbh/nova/einstein/relativity/

This website contains a lot of good information, but it is not overwhelming, which makes it easy to read. Also, it has illustrations that help you to understand the theory of relativity. It is credible because it was written by a physicist and includes a photograph of him and personal information to confirm that he is an actual person.

This article is about realativity and the cosmos. It gives a background on the essense of gravity and the goes on to tell more about stars. I chose this site because I know that PBS is a trustworthy orgnaization.

this site seems to be very reliable. i chose it because it was one of the first links to come up as one of the most used by other students. it seems to be written by an expert as well.

RT @NMHS_Principal: Hotscience interactive activities from NOVA http://bit.ly/2VlZuv Cool stuff! [from http://twitter.com/MrTRice_Science/statuses/4978995851]

nova interactives archive