Where do these objects come from, andÂ why are there so many types?
Types of Deep Sky Objects
- gas clouds are collapsing, exploding and colliding.
- stars are forming, evolving, and dying.
- all gather into galactic groups due to their mutual gravitational attraction.
- these processes take millions of years or more to happen, so human lifetime is sufficient to observe the evolution of a star.
One place or another
Even our local patch of universe is large enough that we can see all the stages of these processes happening in one place or another Â – Â it is similar to walking down the street and seeing adults, children of all sizes, and pregnant women.Â So soon the picture of how humans are born and grow up becomes apparent – without actually witnessing a person pass through every stage.
Over the past several centuries, astronomers have mad observations of these objects, and have teased out the physical processes involved by scrutinising their light. Â Using spectroscopy and other techniques; we now have a fairly clear idea of what we are looking at – even of our understanding of their formation is not yet perfect – Â let’s run through the major types of objects that you can observe with your telescope today.