PHOTOSPHERE The lowest layer of the Suns atmosphere that is also the visible part we see.

CHROMOSPHERE The middle layer of the Suns atmosphere that is hotter than the Suns surface.

CORONA Top layer of the Suns atmosphere that is millions of degrees in temperature and only visible during a solar eclipse.

SOLAR WIND Wind of charged particles from the Sun that flows out from the Suns corona.

SUNSPOT Dark spot on the Suns surface that usually occurs in pairs. Cooler than the surrounding surface and caused by the Suns magnetic field.

FUSION Process in a stars core in which atoms are joined together to form heavier atoms by extreme heat and density.

SPECTRUM All of the wavelengths of electromagnetic radiation arranged from shortest to longest.

BINARY STAR Two stars that orbit a common center of mass.

PARALLAX Apparent shift or change in position of an object caused by a change in position of the observer.

PROTOSTAR Hot, dense object at the center of a collapsing nebula that will become a star when nuclear fusion reactions begin.