I've been meaning to ask Vladimir this for some time. You know how NASA updates their star and planet database periodically. Are you planing to do that on a regular basis (weekly, monthly etc.) or with every new release of Space Engine?
NASA don't have databases. They're made by astronomers. NASA in not an astronomy institution, but an aerospace agency. Astronomers make and update databases every time. But in SE I can't use many for an important reason: usually there is no distance data for objects in database, only celestial coordinates. Measuring distances in Universe is a very hard thing. Without distance, having two celestial coordinates, I can't put them in 3D space in SE. For example, 2MASS sky survey has a 2 billion star catalog, but without distance values they're useless for me. The same with exoplanets: many of them have no distance to parent star detected (almost all Kepler's planets).
I update exoplanets catalog for every release, but other catalogs are left old (stars and galaxies).
I can't wait for the Gaia catalog to be released (probably not until at least 2020, but it will be nice ). The Gaia mission has really excited me for a long time, and I hope it gets launched without any further delays and has a successful mission.
glesage, all of our astronomy is based on Earth, that includes all coordinates. It would be impossible to make a coordinate system based on anything else unless we were either observing from there or knew the exact 3D position of the objects we wanted to give coordinates to, which we obviously don't since that's why we can't put all of these things in SE.