Sunlight makes us happy. Numerous inhabitants of Zurich feel this instinctively and flock to the open air baths. The aerial photograph from the holdings of the photo agency Comet shows the recreation area Katzensee near Zurich.
A century of sunspots on 28,000 sheets
Sunspots are patches on the sun’s surface which, at around 4,000°C, are considerably colder than their surroundings. They are formed by disturbances in the sun’s magnetic field.