Dark spots on the sun that are visible with the naked eye at sunrise/sunset are sunspots, which are cold areas caused by the sun's magnetic field.
the dark parts
A sunspot is a dark spot on the sun's surface. It is darker because it is cooler than most parts on the sun.
Dark Is the Sun was created in 1979.
We call them sunspots, but dark and cool are relative terms. A sunspot is dark only relative to the surrounding solar surface, but still intensely bright compared to your common household light bulb. It's cooler than the surrounding solar material, but still hot enough to vaporize a spaceship and anyone inside it in a fraction of a second.
Dark Is the Sun has 405 pages.
The duration of Dark of the Sun is 1.67 hours.
Dark of the Sun was created on 1968-07-03.
What are the dark patches on the sun's surface called
The ISBN of Dark Is the Sun is 0-345-27684-1.
The Dark Side of the Sun was created on 1976-01-26.
Dark Sun - novel - was created on 2008-03-06.
Dark Sun Boxed Set was created in 1990.