Leaf Nebula

The Leaf Nebula is a planetary nebula in the Silky Way Galaxy. It is very young at only 5 thousand years. It gained it's name from the vibrant green color and leaf-like appearance as seen from some systems.
== Physical Characteristics ==
The Leaf Nebula has a diameter of 2.4 light years. It's classified as an emission nebula and a planetary nebula. It's formed out of ionized gas and emits light of various wavelenghts, hence the title of an emission nebula. It's expansion velocity is equal to around 72 km/s. 
=== Composition ===
The Leaf Nebula is mostly composed of hydrogen (67%), helium (9%) and lithium (4%) but also an abundance of ionized oxygen (18%), from which it appears green in colour. It is one of the greenest objects in the Silky Way and on the night sky of some planets, it can appear like a star that is green.
It is unknown why the Leaf Nebula is mostly only green and not more colorful, considering it is composed of a large amount of hydrogen, which should appear red. Many scientists are are trying to explain this, but no explanation for this phenomenon has yet been found.
=== Location ===
The Leaf Nebula is located almost outside The Ring of the Silky Way, from the side of The Gap, about 26 500 light years from The Core.
== Formation and Evolution ==
Five thousand years ago the red giant Exotis, which even earlier most likely was an A-type main sequence star of 2.6 M⨀, shed its outer layers creating the Leaf Nebula. 
Within the next few thousand years the Leaf Nebula will fade away and Exotis will cool down and become a white dwarf, which eventually in the end, will become a black dwarf. 
== Central Star ==
Exotis is Leaf Nebula's central star. It is a pre-white dwarf in the CSPN stage (Central Star of a Planetary Nebula). It has a mass of 0.6 solar masses, a radius of 7 474 km and a temperature of 89 441 Kelvin. Not much is known about it due to it being mostly obscured by the Leaf Nebula. No planets have yet been detected around Exotis and it is unclear if even any exist.
=== Exotis in detail ===
Spectral Type 	CSPN
Mass 	0.6 Solar Masses
Radius 	7 474 km
Surface Temperature⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀	89 441 K
Luminosity 	1.62851064 Solar Luminosities⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀
Density 	684 105 g/m³
Surface Gravity 	1 426 748 m/s²
Age 	5 thousand years
Planets 	
== Trivia ==
-The image of the Leaf Nebula is the image of the planetary nebula IC 289 taken by the Hubble Space Telescope. (Link to the image)
File:Fake colour leaf nebula.jpg|Enhanced color image of the Leaf Nebula.
File:Enhanced leaf nebula.jpg|Enhanced color image of the Leaf Nebula.
File:Exotis.png|Exotis, the central star of the Leaf Nebula.
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Category:Nebula
Category:Stars