Methane planet

Methane planet is an assumed class of planet with surface covered in lakes or oceans of with methane clouds in the  like it is on, the largest  of.

Appearance
Viewed from space, methane planet would appear blue to aqua green because methane absorbs red light and reflects blue and green light. Some methane clouds appear white because they contain (P) while others are orange because they contain.

Atmosphere and climate
Methane planets tend to have similar s to Earth's, except it uses methane as a "variable gas" instead of as it is on Earth. For example, there are methane rain or methane snow instead of water rain or water snow. Those planets tend to be frigid, at around −290°F (−179°C). Their atmospheres tend to be composed mostly of (N$2$) and  (O$2$) with variable amounts of methane (CH$4$) and trace amounts of  (NO) and other gases.

Methane planets tend to be hazy like Titan, because stellar radiation break methane molecules apart and form different s, such as (C$2$H$6$),  (C$4$H$2$),  (C$3$H$4$),  (C$2$H$2$) and  (C$3$H$8$). This breakdown can also produce non-hydrocarbons such as (CO$2$),  (CO),  (HCN),  ((CN)$2$), and  (C$3$HN).

Life
The -bearing status on methane planets are fair. Life on methane planets are strange that they can adapt to extreme cold and use methane as a, whereas life on Earth use water as a solvent. Under a hazy atmosphere, the plant life rely on as there are not enough light for  because methane planets orbit far from the light of their parent stars. It is predicted that plants use methane (CH$4$) and nitric oxide (NO) to produce (CH$3$OH), nitrogen (N$2$), and oxygen (O$2$):


 * 2 CH$4$ + 4 NO + energy → 2 CH$3$OH + 2 N$2$ + O$2$.

It is also predicted that animals take in oxygen and release nitric oxide instead of. Animals also eat foods rich in methanol and drink liquid methane. The main on methane planet is the  compared to the  here on Earth.

However, life on some methane planets may not be but  as they have better survivability to extreme cold than carbon-based life.

Abundance
There are an estimated 43 billion methane planets in alone, more than half as abundant as s. They make up 10% of all 524 billion terrestrial planets 52‰ of all 820 billion planets in our galaxy.