We have lot of online photo edit soft wares, but FotoFlexer is very good and easy to use and very useful software. In my opinion this is very best alternative for Photoshop. The difference is Photoshop, you need to install. But FotoFlexer is no need to install. If is online photo edit software, where it allows every type of editing.
If you want to see planets and its movement, stars, our solar system and galaxy… normally you need to visit any nearest planetarium.
But, no need to visit planetarium now. Just install this free celestia software and visit the planet you want to visit at your home, in your PC.
Celestia
... The free space simulation that lets you explore our universe in three dimensions. Celestia runs on Windows, Linux, and Mac OS X.
