Stars

Front 1

Doppler Effect

Back 1

A change in the observed frequency of a wave, as of sound or light, occurring when the source and observer are in motion relative to each other, with the frequency increasing when the source and observer approach each other and decreasing when they move apart. The motion of the source causes a real shift in frequency of the wave, while the motion of the observer produces only an apparent shift in frequency

Front 2

Photosphere

Back 2

The visible outer layer of a star, especially of the sun.

Front 3

Chromosphere

Back 3

An incandescent, transparent layer of gas, primarily hydrogen, several thousand miles in depth, lying above and surrounding the photosphere of a star, such as the sun, but distinctly separate from the corona

Front 4

Solar Wind

Back 4

A stream of high-speed, ionized particles ejected primarily from the sun's corona

Front 5

sunspot

Back 5

Any of the relatively cool dark spots appearing periodically in groups on the surface of the sun that are associated with strong magnetic fields.