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Electromagnetic repulsion

What natural barrier tries to prevent two protons from combining?


Not associated with the active Sun

radiative zone, convective Zone, chromosphere

From inside out, correct order for the structure of the sun


A loop of gas following the magnetic field lines between sunspots poles

converted to energy

In the proton-proton cycle, the helium atom and neutrino have less mass than the original hydrogen. What happens to the "lost" mass?


The light we see from the Sun come from which layer?

bright orange, like Arcturus

How would sunspots appear if you could magically remove them from the Sun?

radiative diffusion, convection

What two energy transport mechanisms, in order from outside the core to the surface, is found in the Sun?


The density of the Sun is most similar to which object?

the total energy emitted by the Sun in all directions

The luminosity of the Sun is a measure of?

10 million K

The critical temperature the core must reach for a star to shine by fusion

the corona is much hotter than layers of the Sun that are closer to the solar interior

What is it about the Sun's corona that astronomers don't understand?


The percentage (by mass) of the Sun that is Hydrogen is about

is balanced by the inward gravitational pressure

The outward pressure of hot gas in the Sun

They are extremely hot, but cooler than the surrounding areas of the Sun

Sunspots are dark splotches on the Sun. Which statement is true

27 percent

The percentage (by mass) of the Sun that is Helium

eleven years

the numbers of sunspots and their activity peak about every

gravitational collapse of the helium coreward

The primary source of the Sun's energy is

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