The Eagle Nebula
The stunning picture above was dubbed the Pillars of Creation and is found in the Eagle Nebulae in the constellation of Serpens. This type of nebula is sometimes called a Stellar Nursery and is generally where stars form out of the gas and dust.When a small amount of gas, which is denser in that place than in the rest of the nebula, gravity takes over and more gas and dust is attracted to this spot, and eventually a star is born. Young stars are always found in these types of nebula and all the stars formed tend to have a similar age.
The Helix Nebula
The picture above shows another type called a Planetary Nebula called the Helix nebula. Generally these are formed when a massive star, called a Red Giant, reaches the end of it's life and begins to die in a process known as a Supernova. The star throws of an outer shell of gas and dust and becomes a smaller kind of star known as a White Dwarf.
The Cat's Eye Nebula
There are more reasons than I've went into for these beautiful wonders of the Universe that I've saved for another post. But what do you think? Do you have a favourite?