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Compared to optical telescopes, radio telescopes are built large because

A major advantage of a Newtonian reflector over a refractor is

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.