Unlike the and Millennium databases, we do not support SQL queries. Users of Skies & Universes are expected to download data and write their own routines to analyze the data. We do not provide computing facilities to do the analysis. Care should be taken when downloading data. Do not download many files at once. Wait until the previous file retrieval finishes before you start the new one. Depending on the speed of connection it may take hours to download a single file.