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According to Chapter 2, what is the difference between a subject and a topic?

According to Chapter 18, how should you cite a work that does not have an author listed? 

While both Ptolemy and Copernicus assumed all orbits were __________ , Kepler’s first law corrected this and made planetary motion predictable.

The light-gathering ability of a telescope is most dependent on the diameter of its primary objective.

What is true of radio telescopes?

The __________ Observatory is the x-ray equivalent of the Hubble Space Telescope.

Kepler’s third law relates the square of the planet’s orbital period in years to the cube of its average distance from the Sun in astronomical units.

__________ optics greatly reduces the effect of atmospheric turbulence by deforming the shape of the mirror by computer control.

Radio telescopes are usually used only at night, but optical telescopes can be used day or night.

When used in a single instrument to greatly enhance its resolution, the four separate mirrors of the new VLT will be acting as an _________.