What are the circles around the nucleus called

This is a mixture that has the same composition throughout.

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.

Using data from seismic waves, geologists have learned that earth’s interior is made up of several