This applet shows a true 3D map (atlas or model) of stars and other objects in the Milky Way and thousands of other galaxies near or far away. You get the 3D effect when you turn the universe around as a ball by dragging it with the mouse. "True" means that positions of stars and galaxies are correct (but sizes are not).
Changing to one or several other files, turn the universe around and do some zooming is fine. But there are many other possibilities. To get explanations and use them all take time to visit the Large Structures Applet.
My applets have benefited from data compilations made by others. I have adapted files as they appear on several sites, especially
You should use the button "Data" down left in the applet to see more details concerning the sources of each individual file.