Image of the Day

1 of 16

I’m a Few Years Older Than You

Credit: ESA/Hubble & NASA
Tuesday, April 22, 2014: Messier 5 shines as a globular cluster consisting of hundreds of thousands of stars bound by their collective gravity. Messier…Read More »

5, unlike other globular clusters, dates back to close to the beginning of the universe, at some 13.8 billion years of age. It also represents one of the biggest clusters known, lying at a relatively close distance of only 24,500 light years away, making it a popular target for astronomers. Strangely, Messier 5 should, at its advanced age, consist of old, low-mass red giants and other ancient stars. However, it harbors many young blue stars known as “blue stragglers.” These stars emerge when stars collide or rip material from others.

— Tom Chao   Less «
More from