Astronomers discovered that many spiral galaxies contain supermassive black holes at their centers.

The mathematician sketched an arithmetic spiral on the chalkboard to illustrate linear radial growth.

During the long exposure, the photographer captured the faint glow of a distant spiral nebula.

At dusk, the community gathered in the clearing to perform a spiral dance around the ancient oak.

The pilot realized too late that the aircraft had entered a graveyard spiral and could not be recovered.

The flight recorder revealed the aircraft went into a death spiral after the tail separated.

The old lighthouse had narrow spiral staircases that creaked under every step.

Through the telescope, I could clearly see the spiral galaxy shimmering with young blue stars wrapped around its luminous core.

The mathematician carefully sketched a spiral of Archimedes on the blackboard to demonstrate how a curve can increase its radius at a constant rate.

The mathematician sketched an Archimedean spiral on the board to demonstrate how the distance from the origin grows at a constant rate.