How to Recognize and Analyze Main Ideas in Nonfiction Passages - SSAT Elementary Level Reading

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"Jupiter's Moons" by Brooke Petruzzelli (2013)

The planet Jupiter has many moons. The most well known moons are the four biggest moons. The Italian astronomer, Galileo Galilei, discovered these four moons in 1610. They are named Europa, Ganymede, Callisto, and lo. The biggest of these four moons is Ganymede with a diameter of 5,262.4 km. In fact, if Ganymede were not bound to Jupiter, it would be considered a planet in its own right. Callisto is almost an exact twin of the planet Mercury, Europa is very smooth, and lo is has many active volcanoes. Although there are 57 moons that have been discovered around Jupiter, these four are the most well known.

What is the main idea of this passage?

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Answer

Since this passage is mostly about the four biggest moons of Jupiter, this is considered the main idea. There are many specific details about the moons, but they are all related to the main idea: Jupiter has four big moons.

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