Redshift is a great program that brings the night sky to your desktop. You can travel to stars, nebulae and clusters in the depth of the Galaxy and even fly around the Milky Way.
You can perform various amazing 3-D flights and visit all planets in our Solar System and their main moons. Detailed surface maps display those objects in a close-up right before your eyes.
Once you have arrived at your target object, you can enter into an orbit around the celestial body, just like an astronaut in a real spacecraft.