It had been believed that all planets orbit a star, but scientists found the first of dozens of free-floating, planet-like objects in 2002 in the constellation Orion. It is not known how these planets came to be. Scientists theorize that the objects might have once orbited stars but were kicked out of orbit for some reason. Another theory is that the planets might have been created through the collapse of dust and gas clouds. In 2012, a free-floating planet named CFBDSIR2149 was discovered less than 160 light years away from Earth, making it one the closest known planets of this type.
More about the planets:
So in general how many planets do we have?
Secondly, why is it hard to pronounce the name of the newest planet? The name is not like a proper name like the rest of others.