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The sentence that best describes the central idea of the text is

"By mapping Jupiter's gravitational and magnetic fields, Juno can determine the mass of Jupiter's core."

Explanation:

The given text talks about the spacecraft named Juno. The spacecraft was launched into Jupiter's orbit in 2011 and entered on July 4, 2016.

The central idea of the text is to inform readers about the spacecraft Juno. The article also informs that how Juno helps the scientists to study the planet Jupiter.

The sentence that best describes the central idea of the text is

"By mapping Jupiter's gravitational and magnetic fields, Juno can determine the mass of Jupiter's core."

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