When we examine all the photons hurtling towards earth from the Sun, green is the most predominant colour, because the blues and purples get scattered, while at the other end of the spectrum, reds, oranges and yellows are denser and we see those colours at Sunset, or when there is a thick haze in the sky. In the middle of the day when the Sun is high overhead it is actually more bluish. Astronomers use a method called spectroscopy to examine the colours of stars and work out their composition and heat. But basically, once we get away from Earth, we see that the Sun is white.
Because the Sun is made of plasma, it’s also highly magnetic. It has north and south magnetic poles like the Earth, and the magnetic field lines create the activity we see on the surface. The darker sunspots – cooler areas which last for a few months and vary greatly in size – are created when magnetic field lines pierce through the Sun’s photosphere. The amount of activity on the Sun rises and falls over an 11-year cycle. Sunspots appear in cycles and sometimes there are none visible at all. At the low point, called solar minimum, there are few, if any sunspots.