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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.

In general, as a telescope’s diameter increases, its angular resolution ________ .

Which of the following demonstrates the correct way to format a parenthetical reference (aka an in-text citation)

The __________ focus reflector needs only a single optical surface to form images.