Why does this large crater on Mercury have two rings and a smooth floor? No one is sure. The unusual feature called Vivaldi Crater spans 215 kilometers and was imaged again in great detail by ESA's and JAXA's robotic BepiColombo spacecraft on a flyby earlier this month. A large circular feature on a rocky planet or moon is usually caused by either an impact by a small asteroid or a comet fragment, or a volcanic eruption. In the case of Vivaldi, it is possible that both occurred -- a heavy strike that caused a smooth internal lava flow. Double-ringed craters are rare, and the cause of the inner rings remains a topic of research. The speed-slowing gravity-assisted flyby of Mercury by BepiColombo was in preparation for the spacecraft entering orbit around the Solar System's innermost planet in 2026.
HD image: LINK ๐ธ
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Project Website: LINK ๐
Name | Craft |
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Oleg Kononenko | ISS |
Nikolai Chub | ISS |
Tracy Caldwell Dyson | ISS |
Matthew Dominick | ISS |
Michael Barratt | ISS |
Jeanette Epps | ISS |
Alexander Grebenkin | ISS |
Butch Wilmore | ISS |
Sunita Williams | ISS |
Li Guangsu | Tiangong |
Li Cong | Tiangong |
Ye Guangfu | Tiangong |
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