World Wide Telescope is really cool

This isn't really related to anything I talk about, but I thought that Microsoft Research's World Wide Telescope is pretty fun:  https://worldwidetelescope.org.

This is a free program you can install and then it lets you zoom in on celestial objects like a virtual planetarium.  It zooms pretty well and expands to lots of hubble and other photos, so you can drill down pretty far on parts of the sky.