Sentences with phrase «number of sunspots visible»
A: The sun is now just about at the peak of its 11 - year solar cycle, meaning that there are a significant number of sunspots visible.
http://www.sciencemag.org/ Not exact matches
Just keeping count of the number of spots, for example, led to recognition of the 11 - year sunspot cycle that waxes from «solar minimum,» when very few spots are seen, to «solar maximum,» when great conglomerations of planet - size splotches pockmark the photosphere, or visible surface of the sun.
This new window on the Sunspot Number is just the visible part of an ongoing modernization and expansion of the historical Sunspot Number series that started several months ago.