* Light is emitted, not reflected: The color of light we see is determined by the wavelengths of light emitted by the object, not reflected off it. For example, a red apple doesn't reflect red light, it emits red light. This emission is related to the object's chemical composition and temperature, not its movement.

* Doppler effect: The Doppler effect is the change in frequency (and thus wavelength) of a wave due to the relative motion between the source of the wave and the observer. This applies to light, and is known as the Doppler shift.

Here's how the Doppler shift can tell us about an object's movement:

* Redshift: If an object is moving away from us, the wavelengths of light it emits are stretched, leading to a shift towards longer wavelengths (redder colors).

* Blueshift: If an object is moving towards us, the wavelengths of light it emits are compressed, leading to a shift towards shorter wavelengths (bluer colors).

Key points:

* The Doppler shift is a tiny effect for everyday objects, so it's not something we notice with our eyes.

* The Doppler shift is most useful for studying the movement of celestial objects like stars and galaxies, where speeds are much higher.

In summary: The color of an object doesn't tell us about its movement, but the Doppler shift of its emitted light can reveal if it's moving towards or away from us and how fast.