Astronomers discover 5-planet system and sun

The star is 127 light years away, in the southern constellation of Hydrus.

The researchers used the European Southern Observatory (Eso) to monitor light emitted from the system and identify and characterise the planets.

They say this is the "richest" system of exoplanets - planets outside our own Solar System - ever found.

Christophe Lovis from Geneva University's observatory in Switzerland was lead researcher on the study. He said that his team had probably found "the system with the most planets yet discovered".

"This also highlights the fact that we are now entering a new era in exoplanet research - the study of complex planetary systems and not just of individual planets," he said.

The research has been submitted for publication to the journal Astronomy and Astrophysics.

Eso's High Accuracy Radial velocity Planet Searcher (or Harps) instrument was responsible for the discovery.