The Kepler mission’s goal is to explore planetary systems. To do so, the team must a specially designed instrument called the Kepler instrument. The instrument a specially designed telescope called a photometer or light meter. It a large field of view: 105 square degrees, which is about the area of a hand held at arm’s length. Results from the Kepler mission’s study scientists to understand Earth’s place in the solar system.
After the helping verb “must,” use the base form of the verb: “must use.” “Used” and “will use” do not fit this construction. The correct choice is “use.”
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