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Question 2:
Why do you think the discovery of the smaller moons of Pluto was made by the Hubble Space Telescope?
Student answers will vary but may include the following idea: a space-based telescope can see more details because there is no atmosphere to blur the images. In preparation for the New Horizons mission, launched in 2006, astronomers have been studying Pluto in greater detail. Astronomers have used Hubble, for example, to study the solar system, our Milky Way galaxy, and the nearby and distant universe. Hubble observations of Pluto became a priority, however, after the launch of New Horizons. As New Horizons heads toward Pluto, scientists worry about unknown space debris hitting and damaging the spacecraft, so searching the area around Pluto for unseen space objects became a priority.

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