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Galileo’s discovery of four moons orbiting __________ provided a working model for the Copernican solar system.

In blackbody radiation, the energy is radiated uniformly in every region of the spectrum, so the radiating body appears black in color.

According to Copernicus, the retrograde motion for Mars must occur:

Galileo found the rotation period of the Sun was approximately

According to Wein’s law, the higher the surface temperature of a star, the redder its color.

The product of the wavelength times the frequency of a wave is its __________ .

The Sun’s observed spectrum is:

Only people in the Moon’s umbral shadow can see a total solar eclipse.

In astronomy, an interferometer can be used to

The twinkling of starlight and the focusing of images by lenses are both due to __________ of light.