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The cold and remote planets originally earned their label of "ice giants" to contrast their interiors from those of Jupiter ...

A brilliant point of light is rising in the eastern sky soon after dark this month, drawing comparisons to the "Star of ...

A Mars-size object called Theia smashed into Earth, and the debris coalesced into the moon. Now scientists believe they may have identified pieces of Theia at the bottom of Earth’s mantle. A new study ...