i haven't gone so far :-( , i watch Solar or Lunar eclipse when they happen
Celestia lets u go to several stars in the visible universe. They've
included details of almost all extraterrestrial objects. You can even get
up
close and personal with some spacecraft. like ISS / Hubble / MIR etc. If
you
go far off enough the solar system, you can even meet the long dead
Cassini.. ;-)