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A gravity globe, or grav globe, was a human device to provide massive illumination. It could be sent aloft under its own power so that it would "hang" at a set height and provide light in a large space. Gravity globes were particularly useful in large dark caves.

Ida Scott used a globe to light up a cavern ten miles beneath Krop Tor's surface. (TV: The Impossible Planet / The Satan Pit)

The Eleventh Doctor used a globe to light up the Maze of the Dead. (TV: The Time of Angels / Flesh and Stone).

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