I was reading somewhere that the because of the red shift it can be concluded that the galaxies are moving away from us. But still when we talk about stars, red color refers to cooler stars rather than stars moving away from us.
The temperature of a star is given both by its colour and its spectral class, these two measurements of temperature ought to agree, if they don't then some correction is necessary.What makes it so easy to distinguish between the two effects?
The color of the Star has nothing to do with determining its blue or red shift.nseth1 said:But for a lot of these stars we cannot be sure if they are stationary because of the distances involved (TRUE or FALSE?).
If we are not sure, then we can also conclude that their blue color is because they are moving towards us. What makes it so easy to distinguish between the two effects?
You can guess that I am a novice at Physics and trying to figure out some concepts :-).
Is that why the Gauls in the Asterix comics were scared of the falling sky since it is blue in color? ;-)