New world is just a big baby.
The infrared Spitzer space telescope identified the planet which is thought to be a million years old,meaning it is a mere baby.
The object is in the constellation Taurus, 420 light-years away. Until now the youngest known planets observed have been several billion years old.
Our solar system is four-and-a- half billion years old.
Astronomer Ed Churchwell,of the University of Wisconsin, said the discovery ``knocked our socks off''.