We've been here before, with stars older than the age of the universe. Last time, we thought that there was only one kind of Cepheid variable. This lead to unde

We've been here before, with stars older than the age of the universe. Last time, we thought that there was only one kind of Cepheid variable. This lead to underestimating the age of the universe. Later, astronomers realized the nearby Cepheid variables (used for calibrating the period/luminosity relationship) differed systematically from the bright Cepheid variables that we could see in distance galaxies. Understanding the difference between Type I and Type II Cepheid variables lead to a greater estimate for the age of the universe, resolving the difficulty. So I expect some interesting astronomy to come out of tracking down the cause of this discrepancy.