“Unexpected” –Monster Planet Discovery: ‘Largest in the Universe Nixes Existing Theories’




A giant planet – the existence of which was previously thought extremely unlikely – discovered around a small star by an international collaboration of astronomers last fall is the largest planet compared to the size of its host star ever discovered in the universe – it contradicts theories that a planet of this size could not form around such a small star. The research has identified the unusual planet NGTS-1b – the largest planet compared to the size of its companion star ever discovered in the universe.

Discovered using the state-of-the-art Next-Generation Transit Survey observing facility, designed to search for transiting planets around bright stars. NGTS-1b is the facility’s first detection. NGTS-1b is 600 light years away from us – it is a gas giant the size of Jupiter which orbits a star only half the size of our Sun.


NGTS-1b is a gas giant planet six hundred light years away, the size of Jupiter, and orbits a small star with a radius and mass half that of our Sun. Its existence challenges theories of planet formation which state that a planet of this size should not be formed by such a small star. According to these theories, small stars can readily form small rocky planets but do not gather enough material together to form larger Jupiter-sized planets.

“NGTS-1b heralds an exciting start to planet discoveries with NGTS, as our first planet is something quite unexpected, which challenges our current understanding of what planets form around which stars,” said Dr Edward Gillen, the second author with the University of Cambridge. “Furthermore, NGTS is monitoring many such small low-mass stars, which offers us the opportunity to determine how common planets like NGTS-1b are in the Galaxy.”

The Daily Galaxy via University of Cambridge