It is basically a way to save a bunch of time. I have spent hours at a time looking at different images on diferent sites. This on is pretty much fully interactive. You can scroll the universe.
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I tried it too. In the small print it says 1G of RAM is enough, and it is.
It will take a while to explore the tool and its capabilities properly but it seems you can point your telescope anywhere in the sky and zoom--lots. It has a wonderful way of moving the telescope, with smooth pans and zooms that can be quite dizzying.
As you scan the sky it indicates points of interest you might care to explore further. Place the cursor over stars and galaxies to learn their names.
You can tell it where you'd like your telescope. Default is at Microsoft's labs, but I've moved mine to London so I can see the night sky as it really is over my head.
My only disappointment is that I searched Mars for Beagle and it definitely isn't there :-(