Which of the following can be used to determine the temperature of a star?
a. light from sunspots
b. the star's magnetic field
c. blackbody spectrum
d. line spectra
answer c. blackbody spectrum

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.