The Spectrum of a Star Shows an Equivalent Set of Dark

question 56

Multiple Choice

The spectrum of a star shows an equivalent set of dark absorption lines to those of the Sun,with one exception: Every line appears at a slightly longer wavelength,shifted toward the red end of the spectrum.What conclusion can be drawn from this observation?

• A) The star is moving rapidly toward Earth.
• B) A cloud of dust surrounds the star and absorbs the light.
• C) The star is moving rapidly away from Earth.
• D) The temperature of the star's surface is higher than that of the Sun.