Many star projectors are ambient projectors, meaning they project beautiful, shifting images of nebulae, stars and more. These are excellent for altering the mood in a room, whether you’re trying to lull a child to sleep or want to relax. Many ambient projectors let you customise this display, changing the colours, altering the speed and more.
However, if you go outside, you won’t be able to spot those exact stars because these projectors aren’t scientifically accurate. Ambient projectors offer a more general and impressive representation of the cosmos.
Scientifically accurate projectors, on the other hand, project images of the actual night sky or, at least, a snapshot of it. Some use slides to project NASA imagery of nebulae and planets, an accurate representation of those objects. On the whole, however, they’re less customisable. The latter are better for education, while the former are suitable for relaxation or meditation.