Spacecraft have ventured close to comets, revealing their icy hearts.
Meaning: Space vehicles have gone near comets and shown us that they have ice in their centers.
Choice of Words: Spacecraft are vehicles that travel through space. Ventured means traveled or went to a place. Close means near or not far away. Revealing means making something known or visible. Icy means made of or covered in ice. Hearts is a poetic way of referring to the center or core of something.
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