 This Hubble image shows NGC 4639, a spiral galaxy located 78 million light-years away in the Virgo star cluster. The blue dots in the galaxy's outlying regions indicate the presence of young stars. Among them are older, bright, sea-feed stars. After using sea-feeds to calculate the distance to 4639, the team compared the results to the peak brightness measurements of supernova 1990N, a Type 1A supernova located in the galaxy. Once again, Type 1A supernova were found to be reliable standard candles.