Artist’s rendering of the the twin washing machine-sized GRAIL spacecraft (Ebb and Flow) orbiting in formation above the moon’s surface. Tiny fluctuations in the strength of gravity over different parts of the moon change the distance of the two probes from one another. Credit: NASA/JPL-Caltech/MIT
Read the article: Areavoices: GRAIL twins Ebb and Flow to smash into moon today
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