I was trying to see the planets (our solar system) on google earth recently but there seems to be a problem/bug - they do not display - both in the dedicated app and on the google sky website. When you click on the planets in the app (with error reporting on) you get:
http://mw1.google.com/mw-earth-vectordb/sky/sky0/solarsearch/mars-en-currenthour.kmz 404 not found
...and for all the others (maybe it's something else but they're not working on either right now).
Wonder when it'll be fixed?!
I posted a question on the help forums but no response....