Why do stars in telescope images either appear more warm toned/orange or cool toned/blue?

Question

In the recent telescope image released by NASA, some stars seem to be either more “warm toned” or “cool toned”. I’m just brainstorming but is it related to the distance from Earth? Or perhaps it’s dependent on the elemental makeup. Are they actually different colors or do we just perceive them that way? TIA

In: 2

Answer 1

For the same reason that a train horn sounds higher pitched on approach and lower pitched as it recedes, doppler shift.

In this case its the light thats changing ‘pitch’ (frequency) so the ones scoodling away appear redder while the ones moving towards become more blue.