Summary:
- Astronomers have discovered evidence of a large moon orbiting a distant exoplanet, or a planet outside our solar system. This would be the first confirmed discovery of an exomoon, a moon orbiting an exoplanet.
- The potential exomoon is estimated to be about the size of Neptune, making it much larger than any moon in our solar system. It orbits a gas giant exoplanet that is about the size of Jupiter.
- Detecting exomoons is extremely challenging, and this potential discovery using a technique called astrometry could lead to more discoveries of these distant moons and provide insights into how planetary systems form and evolve.