Google Earth is a interesting application not only for geographers but also for everyone else who is interested in the earth. All the addons that are available for it make it a great experience to learn more about the earth. The sky is the limit, that’s what Google probably thought when they decided to add the Sky - that’s the blue thingy above your head with all the shiny stars - to Google Earth.
The software is still called Google Earth but offers a button that takes you to the sky where you can zoom into stars and galaxies, display additional information such as constellations. Images from the Hubble space telescope are visible and enriched with further explanations of what you are actually seeing when looking at them.
Take a look at the video below to see a short demonstration of some of the features of Google Earth Sky.. They should probably think about a new name for this one.
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Google Earth