Yes! The primary colours red, green and blue are used to produce secondary colours when using the RGB and HSB colour models.
Yes! Both RGB and HSB are additive colour models.
Yes! The colours of primary and secondary rainbows are always in the opposite order.
No! Analogous colours are colours with similar hues.
Yes! A rainbow can form a complete circle when seen from a plane.
Yes! Light can travel through the air and solid materials but also through the vacuum of space.
Yes! The spectral colours red, green and blue can be combined in pairs to produce orange, yellow and violet when using an additive colour model.