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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.

According to Newton, the gravity of the _________ is needed to explain planetary orbits.

Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows

The separation of red and blue light in single-lens telescopes is called __________ aberration.

A total solar eclipse will only occur when the new moon is both on the ecliptic and at its greatest distance from Earth.