Veneneia (crater)

• 1. Introduction

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  Veneneia is the second-largest impact crater on the asteroid Vesta, and one of the largest craters anywhere in the Solar System. At 395 kilometers across, it spans roughly 70% of Vesta's own equatorial diameter. That figure alone raises a question that anchors this story: how does a rocky body survive a collision that carves out a hole nearly three-quarters of its own width? And what does it mean that an even larger crater has since swallowed part of it?

• 2. A Wound in the Rock

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  Veneneia sits at 52 degrees south latitude on Vesta, deep in the asteroid's southern hemisphere. Its diameter of 395 kilometers makes it enormous relative to its host body, a proportion rarely matched anywhere else in the Solar System. The impact that formed it was violent enough to fracture Vesta on a global scale. A series of troughs in the northern hemisphere, on the opposite side of the asteroid, run concentric to Veneneia. Scientists interpret these as large-scale fractures that propagated through Vesta as a direct result of the collision. The largest of these fractures is Saturnalia Fossae, which stretches more than 400 kilometers in length and reaches around 39 kilometers in width.

• 3. Age and Obliteration

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  Veneneia is at least 2 billion years old, and may date back as far as 4.2 billion years, placing its formation near the early period of the Solar System's history. Yet despite its scale, much of the crater is difficult to see today. A younger and even larger impact basin, Rheasilvia, has since overprinted it, overlaying and partially obliterating Veneneia's rim and floor. The two craters now occupy much of the same terrain in Vesta's southern hemisphere, with Rheasilvia having erased a significant portion of the older scar beneath it.

• 4. Discovery and Naming

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  Veneneia was identified by NASA's Dawn spacecraft, which arrived at Vesta in 2011. Dawn's instruments revealed the crater's extent and its relationship to the surrounding terrain, including the concentric trough system in the north. The crater takes its name from Venenia, one of the founding Vestal Virgins of ancient Rome. The Vestal Virgins were priestesses who tended the sacred flame of Vesta, the goddess of the hearth, and Vesta herself is the namesake of the asteroid. The naming therefore carries a chain of association: crater, priestess, goddess, asteroid.