Whatever happened to the 'potentially habitable' planet Gliese 581g (and d and f)?

A grey and barran world is in the foreground with smaller distant worlds in the background and a large orange red star to the right. .

In 2010, astronomers discovered what they thought was the most Earth-like planetary candidate known at the time orbiting a red dwarf star. Today, astronomers no longer think the planet, which they'd dubbed Gliese 581g, nor several of its neighbors, are real.

This is the story of what happened to Gliese 581g — a precautionary tale that reminds us not to take all exoplanet discoveries at face value because, as we shall see, the stars themselves can lie.