May be you have seen home planetarium but the one showing galaxy like are rare ( I haven't seen one yet myself). So I decided to make this super easy-dirt cheap galaxy planetarium. Head on and you will be having your own in less than 5 minutes.
You will need:
1 Plastic Glass
1 thin needle ( you can use anything which is pointed and has more thickness than the needle)
1 medium thickness nail
1 flashlight (mine was Blue LED based. I don't know whether ordinary bulb flashlight will work or not since for "Diffraction" and "Interference" to take place(on which my planetarium is based) you need a monochromatic light .Simply just use a LED flashlight.