As we have seen in How old is a Galaxy, estimating a galaxy’s age is a tricky question. For a star, there are properties which are easy to measure that give clear clues about its age. I’m sure you’re curious to know what these are, so read on to find out!
The Universe is vast. Really vast. Just in the part
that we can actually see from Earth, the observable Universe, there are more
than 2 trillion galaxies, each containing billions of stars. Just in our own
galaxy the Milky Way, there are thousands of star clusters and nebulae. So,
where will your next observation bring you?
remembers the name of our Solar System’s 8 planets, the asteroid belt often
gets forgotten. Situated between Mars and Jupiter, it contains billions of
these asteroids, bodies which can tell us a lot about our past, present and
We have briefly looked at the different types of star clusters in the Deep Sky Classification articles – in summary, globular clusters are tight groups of old stars while open clusters are looser and contain young stars. It is thought that super star clusters, the most massive young open clusters, eventually evolve into globular clusters. Added to that, it is worth mentioning the existence of star clouds, which are large groups of stars which aren’t structured like clusters but can still make nice astrophotography images.