Radiograph of an os penis Small black dots are tiny uric acid stones surrounded by urinary dye. (marvistavet.com)
This event, called a «transit,» will make the planet appear as a small black dot that moves across the surface of the sun for just over seven hours. (businessinsider.com)
On the afternoon of June 5 in the United States, a small black dot will crawl across the blazing face of the sun in one of the rarest celestial events: a transit of Venus, when our sister planet passes between us and our star. (discovermagazine.com)