[Lamplighter]

Here's a video about the "ring nebula" from the Science Recorder

Scientists have known of the Ring Nebula, also known as Messier 57, for centuries.
French astronomer Antoine Darquier de Pellepoix first spotted it in 1779,
and German nobleman Count Friedrich von Hahn made repeated observations
of it over several years leading up to 1800.
Von Hahn recorded seeing changes in the cloud’s middle:
He saw a faint star at the center in his first sightings,
but no more central star in his latter sightings.

Scientists eventually concluded that this nebula has a hollow middle
and ring-shaped—hence came its present-day moniker.
But the latest analysis, led by Robert O’Dell, a physics and astronomy professor
at Vanderbilt University in Nashville, arrived at a wholly other conclusion.
The nebula’s center is quite full, O’Dell and his team state.