First known exomoon could be a baffling monster the size of Neptune

Exomoon

We have seen signs of a gas giant exomoon

Science Photo Library

The first moon orbiting an exoplanet is slowly coming into view. New observations from the Hubble Space Telescope have provided more evidence for an exomoon around a distant gas giant – and if it does exist, it is unlike any moon in the solar system.

In 2017, New Scientist reported that David Kipping and Alex Teachey at Columbia University in New York had spotted a possible exomoon in data from the Kepler Space Telescope, orbiting a distant planet called Kepler-1625b, which is thousands of light …