The color of a star is primarily determined by its composition size apparent brightness age surface temperature

The correct

The color of a star is primarily determined by its Surface temperature.

The explanation:

-Stars emit colors of many different wavelengths, but the wavelength of light where a star's emission is concentrated is related to the star's temperature - the hotter the star, the bluer it is; the cooler the star, the redder it is.

The surface temperature is used to estimate the wavelength that radiated within. the star with lower wavelength tends to have purple-ish color, while the one with higher wavelength tends to have orange-ish color.

For example, the really hot stars, called White Dwarf stars, have a white surface temperature, while a cooler star would have a more red color.

which three statements are true about all alloys?

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.