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terrella
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Terrella

A terrella (Latin of "little earth") is a small magnetised model ball representing the Earth, that is thought to have been invented by the English physician William Gilbert while investigating magnetism, and further developed 300 years later by the Norwegian scientist and explorer Kristian Birkeland, while investigating the aurora.

Terrellas had been used until the late 20th century to attempt to simulate the Earth's magnetosphere, but have now been replaced by computer simulations.

Usage examples of "terrella".

It was our native star, Ma’ak Terrella, the sun under which our race evolved—the star that you visited before you came here.

We formed the First Fleet and struck out for one of the more likely stars nearest Ma’ak Terrella, hoping that was the Lethanta’s destination.