The young star clusters Messier 34 (left) and Messier 36 sparkle in these ground-based images. Using different techniques for the two clusters, astronomers have determined that M34 is about 225 million years old, while M36 is less than 25 million years old. [REU Program/NOAO/AURA/NSF]
Find out more in our radio program entitled Counting Candles.