Revise Topic Sentences

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Instructions: Study the following paragraph to determine its topic and focus, and then revise the existing topic sentence or create one. Remember that your topic sentence may necessitate minor changes to the rest of the paragraph to maintain continuity. To review, see this discussion of topic sentences (opens in a separate browser window).

Item 1 of 2 items

Original paragraph	Topic sentence
Pluto presents significant challenges for spacecraft because of its small mass and great distance from Earth. Voyager 1 could have visited Pluto, but controllers opted instead for a close flyby of Saturn's moon Titan. Voyager 2 never had a plausible trajectory for reaching Pluto. In 2000, NASA cancelled the Pluto Kuiper Express mission, citing increasing costs and launch vehicle delays. The first spacecraft to visit Pluto will be NASA's New Horizons, launched on January 19, 2006.
	Rest of paragraph
	Pluto presents significant challenges for spacecraft because of its small mass and great distance from Earth. Voyager 1 could have visited Pluto, but controllers opted instead for a close flyby of Saturn's moon Titan. Voyager 2 never had a plausible trajectory for reaching Pluto. In 2000, NASA cancelled the Pluto Kuiper Express mission, citing increasing costs and launch vehicle delays. The first spacecraft to visit Pluto will be NASA's New Horizons, launched on January 19, 2006.

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