The latest beta version of Google Earth, available from http://earth.google.com/ has two new sky related features.
I was wondering if anybody had found a hack to make it feel like you were flying a plane over Google Earth scenery, and I was pleased to find that Google have done it themselves. If you hold down CTRL+ALT+A (according to their instructions) you launch a flight simulator, choose your aicraft from two available, choose a starting point, and you can take to the skies. I have tested it by crashing into some trees in Venice. Details on all the controls are here.
On my computer CTRL+ALT+A didn’t work, something to do with having a British keyboard layout, but using the right hand (as opposed to left) CTRL with A (no ALT) worked instead.
There is also an option, which I have not tested yet, to explore space. You choose a location on earth from which to look at the skies and then click the sky button, from there you can explore our solar system and much of the known universe beyond it.