... It's the International Space Station (ISS) caught by chance passing in front of the Sun. Sunspot s, individually, have a dark central umbra , a lighter surrounding penumbra, and no solar panels. ... Also, sunspots occur on the Sun , whereas the ISS orbits the Earth . Transiting the Sun is not very unusual for the ISS , which orbits the Earth about every 90 minutes, but getting one's timing and equipment just right for a great image is rare. ... Publications with keywords: ISS - Sun . ...