Alpha Centauri is a binary star system just 4.3 light years away from our solar system.

In 2012, astronomers announced that the system had a planet, which they dubbed Alpha Centauri Bb as it was apparently orbiting the smaller of the stars, Alpha Centauri B.

However, in 2013, other researchers called into question the existence of Bb, saying the evidence was not good enough.

Brice-Oliver Demory of the University of Cambridge and colleagues have been using the Hubble Space Telescope to search for the planet.

They were not able to find it, but have instead seen hints of a second Earth-sized world in the system, 'New Scientist' reported.

The team observed Alpha Centauri B in 2013 and 2014, for a total of 40 hours.

The 2013 data showed signs of a transit consistent with Bb's suggested orbital parameters, but it seemed to last slightly longer than expected.

That does not mean Bb is not there, just that if it exists, it is unlikely to transit as seen from Earth, researchers said.

The team ruled out errors with Hubble itself or spots on the surface of the star, which can sometimes be mistaken for exoplanets.

The observations point to an Earth-sized planet with a year lasting no more than 20.4 days, putting it slightly further out than Bb but still scorchingly close to the star.

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