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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 _________.

In Ptolemy’s geocentric model, retrograde motion is understood by the planet’s motion along its deferent, and along its epicycle.

Grazing incidence optics are critical to focusing __________ .

All modern large optical telescopes are refractors.

The mean distance between the Earth and the Sun is the ___________ .

According to Chapter 18, what two things are needed to avoid accidental plagiarism? Select all that apply.