You might have heard an expression saying that looking far into the Universe is looking far back in time. And there’s also something about E = mc², right? Let’s organize this knowledge !

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!

In What is a Galaxy, the different types of galaxies were presented. Let’s dig deeper and consider an important information for astronomers: the age of a galaxy.

In “What is a supernova”, we touched upon the ejection of material from a star in its supernova phase. Let’s consider what this material is and, as always, how you can observe it!

In “How does a star die”, we started discussing this end-of-life stage of stellar evolution. Let’s look more closely at the different types of supernovae and, of course, at what you can observe!

In the article about asteroids, we started exploring the similarities and differences between asteroids and comets, so it’s time to learn more about the latter !

Black hole, supernova, neutron star, planetary nebula and white dwarf might all be terms you are familiar with, but in this article, I’ll help you organize your understanding about these objects!

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?

Although everyone 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 future.  

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.