The LEGO Ideas Astronomy theme focuses on sets that are scientific and space based projects such as real world builds like the NASA Curiosity rover to NASA Apollo Saturn V rocket as well as fantasy space projects like the Exo-Suit.
The LEGO Ideas theme, formally known as LEGO Cuusoo, is based around a website which allows users to submit ideas for Lego products to be turned into potential sets available commercially. If fellow users in the LEGO Ideas community up vote the project to 10000 then LEGO Group has a committee which votes on whether to build the set and release it. If the project is approved and cleared for production, it is developed and later released as an official set under the "LEGO Ideas" banner.