Passage Summary: Scientists used a space probe to measure the density of Enceladus and found a layer that is denser than ice but sits above the rocky core, leading them to conclude there is a hidden ocean there.

Conclusion: A layer of liquid water exists between the icy surface and rocky core of Saturn's moon Enceladus.

Reasoning: Data from the Cassini probe indicated a substance denser than ice located between the moon's core and surface, and liquid water is the only substance that fits that density profile.

Analysis: To identify the conclusion here, look for the claim that the rest of the passage is trying to prove. The first sentence provides context, while the second sentence makes a definitive claim ('there must be a lake...') that the subsequent sentences support with evidence from the Cassini probe. In 'Identify the Conclusion' questions, the main point is often placed in the middle of the stimulus, sandwiched between background info and supporting data.