I hope you are observing the sun safely! They are the sun spots you've heard about. They increase and decrease in number, over a cycle of about 11 years. Apparently there is a connecton between sunspots and the condition of the sun's magnetic field.
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A dart board because they look like concentric circles and concentric circles look like circles with a center words like swirly could describe...
It is 2 circles overlapping each other.
Doughnut-shape, or cylinder, depending on how you look at it.
circles are used for the area of pools tables desk or any ferniture.they are also used for making products such as a cutout to look off of.