A gas giant planet beyond the solar that wobbles as it circles its star, hinting to astronomers that it is orbited by its own moon. To make this suspected discovery even more remarkable, if this moon exists it would be absolutely massive, comparable to around half the mass of Jupiter. That would make it thousands of times more massive than any moon orbiting a solar system plane — so massive it could make astronomers reconsider what constitutes a moon.
The extra-solar planet, or "exoplanet," suspected to host this tremendous exomoon is HD 206893 B, a gas giant with 28 times the mass of Jupiter, which orbits a young star located around 133 light-years from Earth. The team behind this research detected signs of the potential exomoon while investigating HD 206893 B with the GRAVITY instrument at the Very Large Telescope (VLT) located in the Atacama desert region of northern Chile.
