An exoplanet that was last seen by Astronomers orbiting its star, Fomalhault, 25 light years away, is nowhere to be seen. It has been suggested that the supposed planet could actually be a dust cloud that formed after the collision of two icy bodies.

source https://gadgets.ndtv.com/science/news/fomalhault-b-nasa-hubble-exoplanet-disappears-2215589