- #1
NebulaBilly
- 14
- 0
I have been having a conversation with a few friends, and we have been discussing the speed of stars in a galaxy base of the wave lengths. We have 2 stars measuring wave lengths 494.6nm and 494.2nm. At rest the wavelength is 486.1nm. From this we managed to deduce that the speed of both stars using Doppler shift is 4011 km/s and 4999 km/s. We then wanted to take this further and calculate the distance of this galaxy but to do this we need to know the recession speed of the galaxy, and we are just not sure how to get that answer, hopefully somebody here can shed abit of light onto it.