Educational resources about eclipses in general and about the 1999 eclipse in particular. [Description from dmoz]
National Aeronautics and Space Administration (NASA) has truly taken the Beatles song "Across the Universe" to heart. The federal agency was founded in 1958 -- partly in response to Russia's launch of the Sputnik satellite -- to research space and flight technology and, in 1969, successfully landed two Americans on the moon. Today it manages the space shuttle program; partners with several nations, including Russia, to build and man the International Space Station; and does research and exploration via unmanned satellites and probes (including the Mars Rovers and the Hubble Space Telescope). NASA plans to retire the space shuttle program by 2010 and deliver man back to the moon by 2020. [Description from Hoover's]
This site reaches over 3.0 million U.S. monthly people.The typical visitor reads Pop Sugar and flies on United Airlines.
Index represents how a site's audience compares to the online internet population as a whole. An index of 100 indicates a site's audience is at parity with the total internet population.
The affinity numbers represent how likely a given visitor is to visit one of the listed sites or categories compared to the internet average. For example, an affinity number of 10.2 would say that a user on "X" website is 10.2 times more likely than the average internet visitor to visit the other site or category that is provided.
This website is Quantified, and the data displayed here is directly measured by Quantcast.
Addicts are the hardcore segment of a site's audience, who have 30 or more visits to that site in a month.
Regulars refers to a segment of a site's audience that frequent a site more than once per month but not as much as addicts who frequent a site 30 or more times per month.
Passers-by have a single visit over the course of a month.