Celestia - real-time 3D visualization of space
The free space simulation that lets you explore our universe in three dimensions. Needs updating to run on latest version of macOS.
Aladin is an interactive sky atlas allowing the user to visualize digitized astronomical images or full surveys, superimpose entries from astronomical catalogues or databases, and interactively access related data and information from the Simbad database, the VizieR service and other archives for all known astronomical objects in the field. The Aladin sky atlas is available in two modes: Aladin Desktop, a regular application and Aladin Lite an HTML5 javascript web widget. Here is the 'Lite' version.
Is a free open source planetarium for your computer. It shows a realistic sky in 3D, just like what you see with the naked eye, binoculars or a telescope.
The Solar & Heliospheric Observatory (SOHO), launched December 2, 1995, is a cooperative project of the European Space Agency and NASA. The satellite was built by Europe and launched by the USA. Ultraviolet light images captured by the Extreme-ultraviolet Imaging Telescope (EIT) aboard SOHO help us understand what is happening on the Sun from day to day. The numbers 171, 195, 284 and 304 refer to the extreme ultraviolet light wavelength in Angstroms. It also has two coronagraphs to study the Sun's outer atmosphere. Daily images are available online and via the "SoHO Viewer" app for the iPAD available in the App Store. Images update frequently and can be refreshed in the app.
