The encyclopedia includes 79,433 articles with 13,741 illustrations, a comprehensive catalog of missiles, spacecraft, space technology, astronauts, and spaceflight from most countries that have had an active rocket research program.

It provides biographies of important pioneers of spaceflight such as Konstantin Tsiolkovsky, Hermann Oberth Robert Goddard.

In addition, the encyclopedia contains many comprehensive review articles on specific space topics, among them: Since 2019, the site is no longer updated or maintained.

[9] The American Astronautical Society gave the site the Ordway Award for Sustained Excellence in Spaceflight History which "recognizes exceptional, sustained efforts to inform and educate on spaceflight and its history through one or more media" in 2015, the award's initial year.

Telepolis journalist Marcus Hammerschmitt warmly recommended the Encyclopedia Astronautic to anyone interested in space flight, and speculated that its articles might become valued material for future researcher of cultural history.