Distance Measurements to a Type-Ia Supernova-Bearing Galaxy
Depicts: NGC 4639, Virgo Cluster, IRAS 12403+1331
Copyright: N/A
The blue dots in the galaxy's outlying regions indicate the presence of young stars. Among them are young, bright stars called Cepheids, which are used as reliable milepost markers to obtain accurate distances to nearby galaxies.
Last Update: 1 September 2019
