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Pluto has long been regarded as something of an anomaly in our solar system.

Compared to neighbouring worlds, the dwarf planet has an extremely tilted orbit which sometimes brings it closer to the sun than Neptune.

Now, astronomers in Spain believe it has yet another unusual feature - the world may be harbouring two supersized planet just out of reach of our telescopes.

Astronomers in Spain believe Pluto (pictured) has yet another unusual feature - the world may be harbouring two supersized planets just out of reach of our telescopes. Researchers at the Complutense University of Madrid have found some strange patterns in the rocky objects around Pluto

According to a report by Nicola Jenner in New Scientist, researchers at the Complutense University of Madrid have found some strange patterns in the rocky objects around Pluto.

In March, researchers discovered a dwarf planet called 2012 VP113, along with up to 900 other objects, orbiting in a similar formation.

These small objects have aligned orbits.

On their own, their mass is not large enough to be pulling on each other, and so researchers in Madrid believe that are being pulled by another, much larger object.

These are the discovery images of 2012 VP113. Three images of the night sky, each taken about two hours apart, were combined into one. The first image was artificially coloured red, second green, and third blue. 2012 VP113 moved between each image as seen by the red, green and blue dots

Scientists believe this object would be a world 10 times the mass of Earth and would orbit at 250 times Earth's distance from the sun.

And they think this planet is moving in resonance with a much larger world.  

They calculated that this second world would have a mass between that of Mars and Saturn, and would orbit 200 times Earth's distance from the sun.

Seeing these planets would be difficult as the large planets would be dim and moving slowly in a large circular orbit, according to New Scientist.

The observable solar system is divided into three distinct regions including the rocky terrestrial planets such as Earth, the gas giants like Saturn and Jupiter, and the icy Kuiper Belt objects - beyond which lies the Oort cloud.

Dr Scott Sheppard, of the Carnegie Institution, who was not involved in this research said: 'The search for these distant inner Oort cloud objects beyond Sedna and 2012 VP113 should continue as they could tell us a lot about how our solar system formed and evolved.'

An orbit diagram for the outer solar system. The sun and terrestrial planets are at the centre. The orbits of Jupiter, Saturn, Uranus and Neptune are shown in purple. The Kuiper Belt, including Pluto, is shown by the dotted blue region. Sedna's orbit is shown in orange while 2012 VP113's orbit is shown in red