How to pronounce “sunspot” in English

So this is a close-up picture of an area of the Sun with a sunspot, the Earth superimposed there for scale.

And he finally came up with this astonishing idea of mutation, that things change because of sunspots or whatever

But in five or six years, when we reach solar maximum, when there are lots of sunspot groups on the sun, this is perfectly OK for watching the sun

And all these little wiggles, they have to do with instrumental noise or the star itself isn't purely constant, like our own Sun has sunspots,