3. Google Sky
You have heard about Google Maps to navigate your way on the ground. But with Google Sky, you can see the outer space as if you are using the most powerful telescope. The images are in amazing quality and in full details too. You will be able to walk through the Milky Way galaxy and learn more about the world outside our planet. It’s pretty fascinating, to be honest and is a perfect way to kill some time and learn something at the same time.