A cluster of eerily circular holes recently appeared in the clouds above Florida, a stunning new NASA image shows. The rare occurrence, which has previously (and incorrectly) been linked to UFOs ...

Once they freeze, they drop out of the sky, forming wispy trails called virga underneath their much larger altocumuls clouds, resulting in circular holes that can easily be spotted from the ground ...

Releasing a handful of salt into a pasta pan can result in a circular ring deposit, which shows the sedimentation history of the particle cloud.