Astronomers have observed an exoplanet orbiting a star in just over 18 hours – the shortest orbital period ever seen for a planet of its type.

This means that a single year for this hot Jupiter-like planet – a gas giant similar in size and composition to Jupiter in our own Solar System – passes in less than a day of Earth time.

Scientists believe the discovery may help solve the mystery of whether such planets are in the process of spiralling towards their suns to their destruction.