Pluto

 

Pluto is 40 astronomical units away from the sun. Its dark having radius of 1188 km. It complete cycle 248 years to earth. It discovered in 1930. It is also known as dwarf planet. Its size even smaller than Russia, moon. Its temperature on surface almost -213 degree celsius. It has rocks in its centre, surrounded by 300km ice to its diameter, crust consist of carbon monoxide, methane, nitrogen. It has toxic oceans contain salt and dissolved ammonia.