If you have a computer in your classroom, you can use NASA's Eyes on the Solar System to show all of the planets, moons, comets and asteroids in our solar system, as well as the NASA spacecraft that explore these worlds. http://eyes.nasa.gov
It works on desktops and laptops, but not on mobile devices like iPads, cell phones, or chrome books.
When you download Eyes on the Solar System, you also get Eyes on the Earth and Eyes on Exoplanets. All of the software is free.
I hope this helps!